Part 18

PLATE 40

1 Caloneis liber (Wm. Sm.) Cl. 81

2 Anomoeoneis sphærophora (Kuetz.) Cl. 80

3 Nitzschia spathulata Bréb. 120

4 Stauroneis ? abnormal 89

5 Navicula ? abnormal 101

6 Podocystis adriatica Kuetz. 129

7 Nitzschia dissipata (Kuetz.) Grun. 120

8 Cymbella ventricosa Kuetz. (zone view) 62

9 Navicula radiosa Kuetz. (zone view) 94

10 Detail of Rhabdonema arcuatum (Lyng.) Kuetz. 35

11 Diatoma anceps (Ehr.) Kirchn. (containing chromataphores) 42

12 Coscinodiscus asteromphalus Ehr. (trans. section, after Pelletan) 23

13-14-15 Transverse section (diagram) of Pinnularia showing straight, oblique and grooved raphes 101

16 Transverse section (diagram) of Biddulphia favus showing inner punctate stratum (after Deby) 31

17 Transverse (ideal) section of Surirella 124

18-19 Transverse (ideal) section of Pinnularia, before and after division 101

20 Transverse section of Nitzschia linearis (Ag.) Wm. Sm. 122

21 Transverse section (diagram) of Navicula 89

22 Transverse section (diagram) of Cymbella 60

23 Transverse section (diagram) of Amphora 65