Part 3

2, 3. P. VARIUS, _Linn._ (_Ostrea._)--_P. monotis._--Brit. co. generally, 3 to 35 fath.; C. Vertically elongate; auricles very unequal.

4. P. NIVEUS, _Macgillivray._--Scotland, R. (15 fath.) Ribs more numerous than _P. varius_; white.

5, 6, 7. P. OPERCULARIS, _Linn._ (_Ostrea._)--_O._, and _P. subrufus_, _pictus_, _lineatus_ (var. f. 6), and _sanguinea_.--Brit. co. generally, 5 to 100 fath., C. As broad as long; ribs rounded.

8. P. AUDOUINII, _Payraudeau._--_P. opercularis_, var., B. Moll.--Ribs angular and squamose.

9, 10. P. DANICUS, _Chemn._--_P._ and _O. pes-felis_, _glaber_, _triradiata_, _adspersus_, _septemradiata_, etc.--Several Scotch localities, 25 to 90 fath., Mc. Very variable, extreme vars. f. 9, 10. Auricles more equal than _P. tigrinus_.

11, 12. P. TIGRINUS, _Müller._--_P. obsoletus_, _domesticus_, _lævis_, _parvus_, etc.--Brit. co. generally, 12 to 60 fath., C. Variable; one auricle minute, the other large and ribbed.

13. P. MAXIMUS, _Linn._ (_Ostrea._)--_P. vulgaris._--Brit. co. generally, 3 to 40 fath. The common eatable Scallop. Valves unequal.

14. P. SIMILIS, _Laskey._--_O._ and _P. tumidus_.--Fr. Forth, Isl. Man, Lerwick, Cape Clear, etc., Mc. Minute, smooth, with undulating marks.

15. P. STRIATUS, _Müller._--_P. aculeatus_, _fuci_, etc.--Scotland, C.; England, R.

16. P. FURTIVUS, _Lovén._--Zetland, Guernsey, etc., 40 to 50 fath., Mr. More rounded, and with auricles less broadly based than _P. striatus_.

HIPPOTHYRIS. Fixed by byssus.

17. H. PSITTACEA, _Gmel._ (_Anomia._)--_A. rostrum-psittaci_, Chem.; _Terebratula psittacea_.--Northumberland, Fr. Forth; deep water, Rr. as Brit. "The Parrot's-beak Anomia."

TEREBRATULA. Fixed by byssus.

18. T. CRANIUM, _Müller._--_Anomia c._, and _T. vitrea_.--Zetland; deep water, unique as Brit. Smooth, oval.

19. T. CAPSULA, _Jeffreys_, _Ann. Nat. Hist._, _Jan. 1859_.--Belfast Bay, R. Minute, punctured.

ARGIOPE, or MEGATHYRIS.

20. T. CAPUT-SERPENTIS, _Linn._ (_Anomia._)--_A._ and _T. retusa_, _pubescens_, _costata_, and _aurita_.--Oban, Skye, etc., 20 to 50 fath., Mr.

21. A. CISTELLULA, _S. Wood._ (_Terebratula._)--_A. seminulum_?, T.

22. A. DECOLLATA, _Chemn._--_A. detruncata._--Guernsey, R.

23. A. SEMINULUM, _Philippi._--Croulin, near Skye, _Jeffreys_.

CRANIA.

24. C. ANOMALA, _Müller._ (_Patella._)--_Pat. Anomia_, _Discina_, and _Criopus distorta_, _ostreoides_, _personata_, and _rostrata_.--Zetland, Arran, Lerwick, Cork, Mr.

PLATE X.

HYALÆA. _Fam._ Pteropoda.

Fig.

1. H. TRISPINOSA, _Lesueur._--Once taken on floating timber, Dublin. Doubtful as British.

SPIRIALIS, or PERACLE. _Fam._ Pteropoda.

2. S. FLEMINGII, _Forbes._--_Fusus retroversus_, Fl.--Zetland, Skye, Arran, Donegal, M. C. Snail-shaped.

3. S. MACANDREI, _F. and H._--Near Mizen Head, S. Ire., Rr. Turreted.

4. S. JEFFREYSII, _F. and H._--Brit. Channel, Rr. Discoid.

CHITON. Sedentary on rocks.

5. C. FASCICULARIS, _Linn._--Brit co. generally, Mc. Tufted margin, small, granules large.

6. C. GRACILIS, _Jeffr._ _Ann. Nat. Hist._, _Jan. 1859_.--Weymouth. Narrow; granules very small; two postero-terminal tufts.

7. C. DISCREPANS, _Brown._--_crinitus_, Pennant?--Tenby, Guernsey, C. Tufted margin, large: granules very small.

8. C. HANLEYI, _Bean._--Scarborough, Skye, W. Ireland, R. Spinose margin.

9, 10. C. MARMOREUS, _O. Fabr._--_C. latus_, Lowe, _C. lævigatus_, _ruber_, and _pictus_.--Scarborough, Forth, Skye, Zetland, W. Ire., R. Margin smooth.

11. C. LÆVIS, _Pennant._--_C. marginatus_, Pult., _C. Achatina_, Brown.--Dorset, Devon; Brit. co. generally, but rare. Dorsally elevated; margin reticulated.

12. C. RUBER, _Linn._--Brit, seas generally, Mr. Valves smooth; margin coriaceous.

13. C. CINEREUS, _Linn._--_C. marginatus_, Penn.?--Brit. co. generally, C. Valves carinated; margin and valves granulated.

14. C. ALBUS, _Linn._--_C. asselloides_, Lowe.--Northern coasts, R. Marginal granules scaly and large; dorsal gr. smaller than _C. cinereus_.

15, 16. C. ASSELUS, _Chemn._--_C. minimus_, _Cinereus albus_.--Brit. co. generally, C. Broad, granules on valves beaded.

17. C. CANCELLATUS, _Sowerby._--_C. albus_, Pult.--Devon, Guernsey, Isl. Man, Oban, Zetland, Loch Carron, R. Narrow, back elevated, else like _C. assellus_.

PATELLA. (Limpet.) Sedentary.

18. P. VULGATA, _Linn._--Brit, generally, Cc. Ribs not toothed.

19. P. ATHLETICA, _Bean._--Devon, Northumberland, etc., Cc. Ribs toothed.

20. P. PELLUCIDA, _Linn._--_P. lævis_, _cærulea_, _Acmæa pel_.--British co. generally, C. smooth.

21. ---- var. _lævis_, Penn.

ACMÆA, or LOTTIA.

22. A. TESTUDINALIS, _Müller._--_P. Clealandi._--North Ire., C. Oval, with tortoise-shell markings.

23. A. VIRGINEA, _Müller._--_P. parva_, _pulchella_.--Brit. co. generally, Mc. Pale, pink-rayed, shallow.

PILIDIUM, or TECTURA.

24. P. FULVUM, _Müller._--_P. Forbesii._--Clyde, Cork, Zetland, etc., R.

PROPILIDIUM.

25. P. ANCYLOIDE, _Forbes._--Lamlash, Ayrshire, etc., R.

DENTALIUM, _Linn._

26. D. ENTALIS, _Linn._--Brit. co. generally, C. Smooth, small end notched.

27. D. TARENTINUM, _Lamk._--_D. vulgare_, _striatum_, _labiatum_, _politum_, _læve_.--South coasts, C. Striated and entire at small end.

PILEOPSIS, or CAPULUS.

28. P. HUNGARICUS, _Linn._--Fool's-cap Limpet.--S. Devon, and Br. co. generally, C.

CALYPTRÆA, _Linn._

29. C. SINENSIS, _Linn._ (_Patella._)--_C. chinensis_, _albida_, _lævigata_.--S. Brit., and Chan. Isls., R. With oblique septum.

PLATE XI.

FISSURELLA.

Fig.

1. F. RETICULATA, _Donov._ (_Patella._)--_P._ and _F. Græca_, _apertura_ (young), _cancellata_, _europæa_.--Hebrides, Thanet, Devon, Ireland. On shells, etc., 1 to 15 fath., C.

2. F. COSTARIA, _Deshayes._--Guernsey, R. More fine and numerous ribs than _F. reticulata_.

PUNCTURELLA.

3. P. NOACHINA, _Linn._ (_Patella._)--_Cemoria Flemingii_, _Fissurella N._, _Rimula Flemingii_, etc.--Scotland and Northumberland, 20 to 100 fath., R. With slit under apex.

EMARGINULA.

4. E. RETICULATA, _Sowerby._--_Patella fissura_, etc.--Brit. co. generally, C. Conical, with slit in margin.

5. E. ROSEA, _Bell._--_E. pileolus_, _conica_, _capuliformis_, etc.--Channel Isls., Exmouth, Cornwall, etc., 7 to 25 fath., Mc. Curved, coarsely cancellated. Red within.

6. E. CRASSA, _Sowerby._--Loch Fyne, Oban and Belfast, 20 to 25 fath., Rr. Large, not cancellated.

HALIOTIS, or "Ear-shell."

7. H. TUBERCULATA, _Leim._--_H. vulgaris_, Channel Isls., Cc.

TROCHUS.

8. T. ZIZYPHINUS, _Linn._-_-C. conulus_, _C. discrepans_, _C. Lyonsii_ (white, ribbed var.), etc. Brit. co. generally, low-water to 50 fath., C.

9. T. CONULUS, _Linn._--Lincolnshire, Rr. More simply conical than the most extreme forms of _T. zizyphinus_.

10. T. ALABASTRUM, _Beck._--_T. formosus_.--Zetland, Lerwick, etc., 45 to 80 fath., R. White, with deep, plain, and beaded ridges.

11. T. MILLEGRANUS, _Philippi._--_T. Clealandi_, _T. Martini_.--Brit. co. generally, 15 to 90 fath., Mr. Granulated, whorls with prominent margin.

12. T. GRANULATUS, _Born._--_T. papillosus_, _T. fragilis_.--Channel Isls., Weymouth, Dublin, etc., R. Like 8, but grained.

13. T. STRIATUS, _Linn._--_T. parvus_, etc.--S. Brit., C. More finely ribbed than _T. exiguus_.

14. T. EXIGUUS, _Pult._--_T. exasperatus_, _minutus_, etc. S. co., C.

15. T. MONTAGUI, _Gray._--_T. striatus_, Forbes.--Scarborough, Exmouth, Cape Clear, etc., C. Elevated, whorls tumid.

16. T. TUMIDUS, _Mont._--_T. patholatus_, _Rackettii_, etc. Brit. co. generally, C. Short, whorls tumid, umbilicated.

17. T. CINEREUS, _Linn._--_T. lineatus_, _T. perforatus_, etc.--Brit. co. generally, C. Littoral, small umbilicus.

18. T. UMBILICATUS, _Mont._--_T. cinerarius_, etc.--Guernsey, S. and W. Brit. co., C. Littoral, umbilicus large.

19. T. MAJUS, _Linn._--_T. tuberculatus._--Brit. co. generally; littoral, C. Broad, tuberculated. Large umbilicus.

20. T. LINEATUS, _Costa._--_T. crassus_, etc.--Channel Isls., Devon. W. Ire., Mc. Smooth, imperforate.

MARGARITA, or TROCHUS.

21. M. UNDULATUS, _Sowerby._--_Turbo carneus_, _M. striata_, etc.--Scotland, 5 to 50 fath., Mc. Striated and undulated.

22. M. HELICINUS, _Fabricius._--_Turbo_ and _Trochus neritoideus_, _margarita_, _M. vulgaris_, etc.--Many Brit. loc.; littoral, C.

23. M. PUSILLUS, _Jeffreys._--Lerwick, R., 10 to 40 fath. Minute, white, depressed.

24. M. EXILIS, _Phil._--_Skenea Cutleriana._--Guernsey, Skye, etc., R. Globose, striated.

ADEORBIS.

25. A. SUBCARINATA, _Mont._--(_Helix_) _Trochus rugosus_, _Cingula subc._, etc.--S. Brit, co., Mr. Depressed, keeled.

SCISSURELLA.

26. S. CRISPATA, _Flem._--Zetland, etc., in sand, Mc.

PHASIANELLA.

27. P. PULLUS, _Linn._ (_Turbo._)--_T. pictus_, _Cingula p._, etc.--Brit. co. generally, C.

PLATE XII.

IANTHINA. Floats on ocean.

Fig.

1. I. COMMUNIS, _Lamk._--_Helix Ianthina_, _I. fragilis_, etc.--Cornwall, Bristol, etc.; oceanic, C. Sides depressed.

2. I. BRITANNICA, _Leech._ _Reeve._--Ireland, Cornwall, etc., Mr. Darkly coloured, not compressed.

3. I. PALLIDA, _Harvey._--_I. patula._--Clare, Rr. as Brit.

4. I. EXIGUA, _Lamk._--Cornwall, Clare, etc., Mr.

NERITINA. In rivers.

5. N. FLUVIATILIS, _Linn._--_N. fontinalis._--Thames, Trent, Humber, etc., Scotch lakes, Cc.

BITHINIA. In ponds.

6. B. LEACHII, _Shepp._ (_Turbo._)--_B. ventricosus_, _Paludina acuta_, _similis_, etc.--Rivers S. Brit., Mr. Narrow, with rounded whorls.

7. B. TENTACULATA, _Linn._ (_Helix._)--_T. nucleus_, _Paludina impura_, etc.--Fresh-water, throughout Brit. Oval.

PALUDINA. In ponds.

8. P. LISTERI, _Forbes and Hanley._--_Helix vivipara_, etc.--Lakes and ponds generally, Mc. Whorls more separate, umbilicus larger than _P. vivipara_.

9. P. VIVIPARA, _Linn._--_Pal. achatina_, etc.--Thames, etc., C.

VALVATA. In ponds.

10. V. PISCINALIS, _Müller._--_Nerita_, _Turbo_, _Cyclostoma fontinalis_, _obtusa_, _thermalis_, etc.--Fresh-water, C. Subglobose.

11. V. CRISTATA, _Müller._--_V. planorbis_, etc.--Many loc., Mc. Orbicular.

LITTORINA. On the sea-shore.

12, 13. L. RUDIS, _Donov._ (_Turbo._)--_L. littoreus_, etc., _L. nigro-lineatus_ (var. f. 13).--British shores generally, Cc.

14, 15. L. LITTOREA, _Linn._ (_Turbo._)--_L. vulgaris_, etc.--British shores generally. The common eatable Winkle.

16, 17. L. TENEBROSA, _Mont._ (_Turbo_).--British shores generally, C. Not thickened at bottom of mouth like _L. rudis_.

18. L. PATULA, _Jeffreys._--_L. labiata_, _L. jugosa_, etc.--Common on our shores.

19. L. SAXATILIS, _Johnston._--_L. neglecta._--Probably _L. patula_ var.?

20, 21. L. LITTORALIS, _Linn._ (_Turbo._)--_T. neritoides_, _T. ustulatus_, etc,--Brit. co. generally. Depressed above.

22. L. FABALIS, _Turt._--_L. Beanii._--Young of _L. littoralis_?

23. L. NERITOIDES, _Linn._ (_Turbo._)--_T. petræa_, _L. cærulea_, etc.--Kent, Sussex, etc., C. With white band.

24. L. PALLIATA, _Say_, (_Turbo._)--Yarmouth, Mr.

LACUNA.

25, 26. L. PUTEOLUS, _Turt._ (_Turbo._)--_Cochlea_, _Helix_, and _Nerita parva_, _fasciata_, _lacuna_, _rufa_, etc.--Brit. shores, C. Globose.

27, 28. L. VINCTA, _Mont._ (_Turbo._)--_T. canalis_, _quadrifasciatus_, etc,--Brit. co. generally, C.

29. L. CRASSIOR, _Mont._ (_Turbo._)--_L. pallidus._--Numerous Brit. co. Thick, conical.

30. ---- var. ? of this rather than of _C. vincta_.

31. L. PALLIDULA, _Costa_, (_Turbo._)--Brit. co. generally, C.

32. L. PATULA.--Fry of _L. pallidula_?

PLATE XIII.

ASSIMINEA.

Fig.

1. A. GRAYANA, _Jeffreys._--_Limneus_ and _Paludina G._--Greenwich and other marshes.

2. A. LITTOREA, _Delle Chiaje_, (_Helix littorina._)--_Rissoa globularis_ and _littorea_.--On shore at Weymouth, Serk, Portland, Mr.

RISSOA, or CINGULA.

3. R. ULVÆ, _Pennant_, (_Turbo._)--_Helix_, _Cingula_, _Paludina_, and _Littorina_.--In brackish water, on British shores, C.

3*. ---- var. _subumbilicata_, R.

4. R. BARLEEI, _Jeffreys._--_R. ulvæ_ var.--Loch Carron, Skye, R.

5. R. STRIATULA, _Mont._--_R._, _Turbo_, _Cingula_, and _Littorina carinata_ and _monilis_.--Devon, Margate, Galway, Herm, etc., 0 to 7 fath., Mr.; S. Eu. Carinated.

6. R. CIMICOIDES, _Forbes._--_R. sculpta._--W. Scotland. Like _R. zetlandica_, but with outer lip crenulated; finely decussated.

7. R. ZETLANDICA, _Mont._ (_Turbo._)--_R._, _Cyclostoma_, _Cingula scalariformis_, _Cyclostrema z._--N. Scotland, 0 to 60 fath., Mc. Whorls angulated.

8. R. CRENULATA, _Michaud._--_Turbo_ and _R. cimex_ and _cancellatus_.--Falmouth, Cornwall, Skye, Galway, C. Very coarsely cancellated.

9. R. CALATHUS.--_Forbes and Hanley._--Sheerness, Whitesand Bay, 15 to 50 fath., R. Finely cancellated.

10. R. BEANII, _Hanley._--Cornwall, Plymouth, Orkney, Galway, C.; N. Eu. Striated.

11. R. ABYSSICOLA, _Forbes._--N. Scotland; deep water, R.

12. R. LACTEA, _Michaud._--_Turbo cancellatus._--Jersey and Medit., Rr. Oval, plicated and striated.

13. R. PUNCTURA, _Montagu._--_Turbo_ and _Cingula_ and _R. reticulata_.--Brit. co. generally, 10 to 20 fath.

14. R. COSTATA, _Adams._--_R._, _Turbo_, _Cingula plicata_, _costata_, and _exigua_.--South co. Brit., S. Wales, Orkneys, Ireland, Channel Isls., 0 to 25 fath., C.

15. R. STRIATA, _Mont._--_R._, _Turbo_, and _Cingula semicostata_, _minutissima_, _communis_, _gracilis_, etc.--Brit. co. generally, N. and S. Eu.; littoral C.

16, 17, 18. R. PARVA, _Costa._--_T._, _C._, and _R. sublutea_, _lactea_, _alba_, etc., _R. interrupta_ (var. f. 17), _R. Sarsii_, var. f. 18 (unique).--Brit. shores generally, C.

19. R. COSTULATA, _Alder._--_Turbo variabilis_, _R. similis_.--Devon, Channel Isls., W. Ireland, etc., C.; S. Eu.

20. R. RUFILABRUM, _Leach._--_R._ and _C. hyalina_ and _punctata_.--Devon, Belfast, etc., Mc.

21. R. LABIOSA, _Mont._ (_Helix._)--_T._, _C._, and _R. membranacea_ and _costata_.--Brit. co. generally, C.

22, 23, 24, R. INCONSPICUA, _Alder._--_R. albula_ and _supra-costata_, var. f. 23, _R. similis_, var. 24, _R. maculata_.--Brit. co. generally, C.

25. R. SEMISTRIATA, _Mont._--_T._ and _R. pulchra_ and _tristriata_.--Brit. shores generally, C.

26. R. CINGILLUS, _Mont._ (_Turbo._)--_R._, _T._, and _C. vittata_, var., _R. graphica_ and _R. rupestris_.--Brit co. generally.

27. R. VITREA, _Mont._ (_Turbo._)--_Helix glabrata_, _R. crystallina_.--Exmouth, Oban, Birterbuy, etc., Mr. Elongated, smooth.

28. R. PROXIMA, _Alder._--A rare Irish species. Elongated, striated.

PLATE XIV.

RISSOA,--_continued_.

Fig.

1. R. PULCHERRIMA, _Jeffreys._--Channel Isls., R.

2. R. SOLUTA, _Philippi._--Exmouth, Bute, Cork, etc., R. Like _R. pulch._, but with spiral striæ.

3. R. ALDERI, _Jeffreys_, _Annals, Aug. 1858_.--Skye, Rr. Larger and more conical than _R. soluta_.

4. R. FULGIDA, _Adams_, (_Helix._)--_Turbo_ and _Cingula f._--Weymouth, Arran, Cork, etc., Mr. Whorls rounded and banded.

5. R. ANATINA, _Drap._ (_Cyclostoma._)--_Paludina_ and _Littorina a._--Very rare, Greenwich marshes.

6. R. EXIMIA, _Jeffreys._--_Chemnitzia Barleei_, Clark.

7. R. VENTROSA, _Mont._ (_Turbo._)--_Cyclostoma_, _Paludina_, and _Cingula acutus_, _ventricosus_, _octona_, _stagnorum_, etc.--Marine shores and brackish-water marshes, Mc.

8. R. DENTICULATA, _Mont._ (_Turbo._)--Herm, Rr.

9. R. UNICA, (_Turbo._)--_Aclis u._, Brit. Moll., _Turritella_, _Pyramis_, and _Chemnitzia_, R.--Devon, Cork, etc., Mr.

10. R. GLABRATA, _Jeffreys._--N. sp.

11. R. CASTANEA, _Jeffreys._--N. sp.

BARLEEIA.

12. B. RUBRA, _Flem._ (_Cingula._)--_Turbo_, _C._, and _Rissoa ruber_, _unifasciatus_, _fulva_.--Herm, Tenby, Dunbar, etc., S. Eu., Mr.

JEFFREYSIA.

13. J. DIAPHANA, _Alder_, (_Rissoa._)--_R. glabra._--Dublin, Swansea, Northumberland, etc.; littoral, R.

14. J. OPALINA, _Jeffreys_, (_Rissoa._)--Channel Isls., R.

15. J. GLOBULARIS, _Jeffreys._--Skye.

16. J. GULSONÆ, _Clark_, (_Odostomia._)--_Chemnitzia G._--Sandwith, Lerwick, Weymouth, etc., Guernsey.

EUOMPHALUS.

17. E. NITIDISSIMUS, _Adams_, (_Helix._)--_Skenea_, B. Moll., _Truncatella atomus_.--Shetland to Channel Isls., Mc.

18. E. ROTA, _Forbes and Hanley_, (_Skenea._)--Donegal, rare. Like a minute Ammonite.

SKENEA.

19. S. PLANORBIS, _O. Fabr._ (_Helix._)--_Turbo_, _Sk. depressa_.--Brit. shores generally, on coastal Corallines, C. Flat, like a _Planorbis_.

20. S. DIVISA, _Flem._ (_Turbo._)--_Helix_ and _Sk. serpuloides_, _Adeorbis striatus_.--Scarborough, Weymouth, Orkney, Galway, etc., 7 to 25 fath., Mr. Striated.

21. S. COSTULATA, _Möller_, (_Margarita._)--Loch Fyne, Rr.

22. S. LÆVIS, _Philippi_, (_Delphinula._)--Newcastle-on-Tyne, Rr.

ACLIS.

23. A. ASCARIS, _Turt._ (_Turbo._)--_Turritella_, _Alvania_, and _Pyramis supranitida_ and _acutissima_.--Ireland, Tenby, Zetland, Mr.

24. A. SUPRA-NITIDA, _S. Wood_ (_Alvania._)--Tenby, Dublin, etc., Rr.

25. A. NITIDISSIMA, _Mont._ (_Turbo._)--_Turritella_, _Pyramis_, and _Chemnitzia_.--Falmouth, Burrow Isl., R.

EULIMELLA.

26. E. SCILLÆ, _Lovén_, (_Turbonilla._)--_Eulima_, _Odostomia_, _Chemnitzia_, and _Eulimella crassula_, and _Macandræi_.--N. Scotland, Croulin, etc., 20 to 90 fath., R.

27. E. ACICULA, Philippi, (_Melania._)--_E._, _Chemn._, _Odost._, and _Eulima clavula_.--Skye, Rr.

28. E. AFFINIS, _Philippi_, (_Eulima._)--_Pyramis_, _Odost._, and _E. gracilis_, _lævis_.--Skye, Torbay, R.

29. E. CLAVULA, _Lovén_ (_Turbonilla._)--_Odostomia c._--Torbay, Rr. Guernsey.

30. E. OBELISCUS, _Jeffreys_, _Ann. Nat. Hist. Jan. 1858._--Shetland.

PLATE XV.

TURRITELLA.

Fig.

1. T. CORNEA, _Lamk._--_T. communis_, var., B. M.--Cork and Zetland, Mr. Whorls less flat and less rapidly enlarged than _T. communis_. A white var. exists (_T. nivea_).

2, 3. T. COMMUNIS, _Risso._--_T. cornea_?, _T. Terebra_.--Brit. co. generally; 4 to 100 fath., Cc. Aperture rather square.

APORRHAIS.

4. A. PES-PELICANI, _Linn._ (_Strombus._)--_A. quadrifidus_, _Tritonium_, and _Rostellaria p._--Brit. co. gen.; N. and S. Eu.; 4 to 100 fath., C. Outer lip with one anterior lobe.

5. A. PES-CARBONIS, _Brongniart._--_Rostellaria_ and _A. p._, and _serressiana_.--Zetland, 70 to 100 fath., R. Outer lip with two anterior lobes.

CÆCUM.

6. C. TRACHEA, _Mont._--_Dentalium_ and _Orthocera imperforatum_, _C. annulatus_.--Devon, Weymouth, Scotland, Cork, etc., R.; S. Eu. Ringed and striated.

7. C. GLABRUM, _Mont._--_C._, _Dentalium_, and _Orthocera minutum_, and _lævissimum_.--Exmouth, Weymouth, Swansea, Lerwick, Bantry Bay. Rare, smooth.

CERITHIUM.

8. C. RETICULATUM, _Costa_, (_Strombiformis._)--_Murex_ and _Terebra r._--Brit. co. gen., 0 to 20 f., C. Narrow, and closely reticulated.

9. C. METAXA, _Delle Chiaje._--_C. angustissimum._--Guernsey, R.; S. Eu. Lengthened, white.

10. C. ADVERSUM, _Mont._ (_Murex._)--_C._, _Triphoris_, _Turbo_, and _Terebra a._, _perversus_, and _reticulatus_.--W. and S. Brit., Channel Isls., etc., 5 to 25 fath., Mr.

CERITHIOPSIS.

11. C. TUBERCULARE, _Mont._ (_Murex._)--_Cerithium_ and _Terebra t._--Brit. co. gen.; S. Eu.; 4 to 40 fath., Mc. Three rows of tubercles in the penultimate whorl.

12. C. CLARKII, _Hanley._--Exmouth, Rr. Two rows of tubercles.

13. C. NIVEA, _Jeffreys_, _Ann. Nat. Hist. 1859_.--In shell sand, Belfast, R. Rather Buccinum-shaped.

14. C. METULA, _Lovén_, (_Cerithium._)--_C. nitidum_, Forbes.--Zetland, 50 to 80 fath., R. White, with angular whorls.

15. C. PULCHELLA, _Jeffreys._--Falmouth, Plymouth, Guernsey, R. Closely whorled and cancellated.

SCALARIA.

16. S. COMMUNIS, _Lamk._--_Turbo_ and _Strombiformis clathrus_ and _clathratus_.--S. co. principally, C. Laminarian zone, S. Eu. Ridges raised; whorls separated.

17. S. GROENLANDICA, _Chemn._ (_Turbo._)--_S. planicostata_, _subulata_.--Fragments only, N. Scotland, N. Eu. Grooved between ridges.

18. S. TURTONIS, _Turton._--Scarborough, Exmouth, Cork, etc., N. and S. Eu., R. as Brit. Ridges flat.

19. S. TREVELYANA, _Leach._--N. Brit., 15 to 85 fath., Mr. Thin, with ribs narrower than _Sc. Turtonis_.

20. S. CLATHRATULA, _Mont._--S. Brit. and Channel Isls., Mr. Small, white, with thin ribs.

STYLIFER.

21. S. TURTONI, _Brod._--_Phasianella stylifera_, _Velutina s._, _S. globosus_ and _astericola_.--On spines of _Echinus sphæra_, Torbay and Berwick, R. Glassy, thin.

EULIMA.

22. E. POLITA, _Linn._ (_Helix._)--_Strombiformis_, _Turbo_, _Rissoa_, and _Phasianella p._ and _albus_, _Boscii_ and _anglica_.--Ireland, S. Brit., E. Scot., N. and S. Eu., 7 to 50 fath., Mr. Rather solid.

23. E. DISTORTA, _Deshayes._--Brit. co. gen., Mc.; 12 to 90 fath.; N. and S. Eu. Small, tortuous.

24. E. STENOSTOMA, _Jeffreys_, _Ann. Nat. Hist. 1858._--Zetland and Norway, Rr. Thin, with rapidly increasing whorls.

25. E. SUBULATA, _Donov._ (_Turbo._)--_Strombiformis_, _Helix_, and _Melania s._ and _glaber_, _trifasciatus_, _Donovani_, and _lineata_.--S. and W. Brit., Ire., Zetland, Medit., 10 to 80 fath., Mr. Whorls deep, banded.

26. E. BILINEATA, _Alder._--Or _E. subulata_, var.--Northumberland, etc. Whorls more swelled than _E. su._, two-banded.

PLATE XVI.

CHEMNITZIA.

Fig.

1. C. ELEGANTISSIMA, _Mont._ (_Turbo._)--_T. lacteus_, Linn.?, _T. acutus._--Brit. co. generally; not deep, C. Interstices of longitudinal ribs smooth.

2. C. SIMILLIMUS, _Mont._ (_Turbo._)--_C. gracilis_, Phil. More slender and minute than f. 1.

3. C. PUSILLA, _Phil. Moll. Sic._ 2. _p._ 224. _pl._ 28. _f._ 21.--More stout than f. 1, with the ribs straight and broad. Medit., Brit.?

4, 5. C. RUFA, _Phil._--And var. _C. fulvocincta_ (f. 5).--Brit. co. generally, 15 to 50 fath., Mc. Spiral grooves between ribs.

6. C. FORMOSA, _Jeffreys_, (_Odostomia._)--Swansea, Shellness, Bantry Bay, etc., Mr. Grooved between ribs, excavated at suture.

7. C. FENESTRATA, _Forbes and Jeffr._ (_Odostomia._)--Torbay, etc., R. With pits between spiral ridges.

8. C. RUFESCENS, _Forbes._--_Odostomia_ and _Turritella indistincta_ and _scalaris_.--Clyde, Hebrides, Oban, 15 to 50 fath., R. More stout than _C. rufa_. Three-banded.

9. C. SCALARIS, _Philippi_, (_Melania._)--Exmouth, Guernsey, Medit., R. Ribbed; whorls angular above.

10. C. CLATHRATA, _Jeffreys._--Birterbuy Bay, R. Lower part of whorls spirally grooved between ribs.

11. C. INDISTINCTA, _Mont._ (_Turbo._)--_Odost._, _Turritella_, _Terebra_, and _Pyramis truncata_ and _speciosa_, etc.--Brit. co. generally, 5 to 40 fath., Mr.; S. Eu. Ribs curved, striated between.

TRUNCATELLA.

12. T. SUBCYLINDRICA, _Linn._ (_Helix._)--_T. Montagui_, _Turbo truncatus_, _subtruncatus_, _Cyclostoma truncatulum_, _Turritella t._ and _s._, etc.--Weymouth, S. Devon, Scarborough, etc., C.

NATICA.

13. N. HELICOIDES, _Johnston._--Scotland, Scarborough, etc., 15 to 40 fath., R.; N. Eu. Thin-grooved suture.

14. N. MONTAGUI, _Forbes._--_Nerita rufa_, _Natica r._ and _rutilla_.--Principally northern loc. In sand and gravel, 12 to 90 fath., Mr. Small, stout.

15. N. KINGII, _Forbes and Hanley._--Northumberland, unique, _Jeffreys_ coll.

16. N. NITIDA, _Donovan._--_Nerita_ and _Natica catena_, _nitida_, _Alderi_, _glaucina_, etc.--Brit. co. generally, 4 to 90 fath., C. Oblique, marked with undulating lines.

17. N. MONILIFERA, _Lamk._--_Nerita glaucina_, _catena_, etc.--Near water-mark, in sandy places generally, C. Whorls rounded.

18. N. SORDIDA, _Phil._--_N. fulva_, _plumbea_, etc.--Scilly, Cape Clear, Zetland, etc., 25 to 90 fath., R.

19. N. PUSILLA, _Say._--_N. Groenlandica_, _livida_, _alba_.--Northumberland, Yorkshire, N. Eu., 45 fath., R. White; umbilicus small.

RECLUZIA.

20. R. APERTA, _Jeffreys._--_Natica aperta_, Lovén?--Zetland, Rr.

VELUTINA.

21. N. LÆVIGATA, _Linn._ (_Helix._)--_Bulla_, _Velutina_, etc.--Brit. co. generally, 1 to 30 fath., N. Eu., C.

22. N. FLEXILIS, _Mont._ (_Bulla._)--_Coriocella_ and _Sigaretus plicatilis_.--N. Scot., 25 fath., Rr.

LAMELLARIA.