Part 2

Differing from _armillaris_ (Müller), _alternata_ (Moore) and related forms in the form and relations of the prostomium and its appendages. The prostomium is broadest anteriorly, narrowing caudad and rounded forward a little at middle in front. A characteristic feature is that the three tentacles are in a transverse line along the anterior edge, the median being thus inserted far in advance of the posterior eyes. A median longitudinal furrow extending forward from caudal edge to base of median tentacle. The anterior eyes much larger than the posterior and farther apart, each somewhat transversely elliptic and located far forward at base of lateral tentacle on its ectal side. The median tentacle about two and a half times longer than the prostomium; in the type composed of twenty-one articles; only a little narrowing over the distal region. Lateral tentacles considerably shorter than the median. Inferior tentacular cirrus about equal in length to the median tentacle, the upper one much longer and consisting of about thirty-four articles. Neurocirri slender, subcylindric, somewhat conical distally or sometimes a little clavate, surpassing end of parapodium. Notocirri in anterior region alternating in length, the long ones surpassing the width of the body proper and consisting of about thirty-two articles while the short ones embrace only near eighteen. Notocirri becoming shorter and essentially uniform in the posterior region. Appendage of setae with subapical tooth larger and stouter, more obtuse, than in _alternata_, making a wider angle with the apical tooth, and always conspicuous; the serrations proximad of the tooth fine and rather long. The body is proportionately rather wide and is depressed or flattened, narrowing in the posterior region but retaining there the depressed form. Number of segments in the type, near one hundred and forty-five. General color yellowish; each somite of anterior region crossed transversely by two fine complete lines of reddish brown color.

Width in anterior region, exclusive of parapodia, about 1.25 mm.; length near 20 mm.

Type--M. C. Z. 2, 147.

Taken at low tide.

The type is a female turgid with eggs. It is remarkable in presenting at the same time a well-developed collateral bud from the ventral surface near the beginning of the posterior third.

_Pionosyllis pigmentata_ sp. nov.

Somewhat resembling _P. elongata_ (Johnson), which also occurs in this region, but differing in having the dorsum pigmented throughout, being black or slaty with pale lines between the segments and dividing each of the latter transversely excepting across the middorsal region. The pigmentation may sometimes be very dilute. In technical details readily distinguished from that species, e. g., in the different form of the appendage of the setae, this being obviously more elongate and erect and proportionately more slender. Two or more dorsal setae differ in having shorter, more strongly curved appendages which are wholly smooth on the concave edge instead of being pubinate to beyond middle as in the others. Prostomium rather short and broad. Palpi thick the ectal lobe small as compared with the principal or mesal one; united only at base. Eyes small, transversely elongate and often curved, the two on each side close together and sometimes almost fused, with the posterior one well mesad of but only a little caudad of the anterior one. Median tentacle situated midway between the two eye groups in a longitudinal furrow dividing prostomium; composed of eighteen to twenty-three short articles. Each paired tentacle at corner of prostomium in front of eye-group of corresponding side; similar in form and size to the median tentacle. Lower tentacular cirrus about equalling a tentacle in length, the dorsal longer, both of similar form. First segment extending forward in a rounded or subtriangular lobe or flap at middle above. The notocirri attached above bases of parapodia as usual; long, composed of numerous short segments; much longer than the tentacles, each average one when laid back along body ordinarily passing over three or three and a half segments. Neurocirri short, stout, fusiform. Body slender, narrowed moderately at the ends, elsewhere of nearly uniform width. Type composed of seventy-three segments.

Length, near 20 mm.

Type--M. C. Z. 2, 148.

Littoral zone.

_Pionosyllis lucida_ sp. nov.

Readily differentiated from _P. elongata_, which it resembles in its pale, translucent appearance, in having the distal appendage of setae more typical, being of a decidedly more elongate and erect form which also differs from that of _pigmentata_. From the latter differing conspicuously in appearance in lacking all dark pigment. Notocirri tapering distad, with apical region slender and pointed; long, exceeding the width of the body and consisting of up to forty-five articles. Differing from _pigmentata_ in the form of the neurocirri which are more uniform in diameter, subcylindric rather than fusiform; normally extending more or less beyond the tip of the parapodium. Prostomium short. Eyes reddish; those of first pair larger than the second; second eye on each side almost directly mesad of the first but only a little caudad of it. The median tentacle farther forward than in _pigmentata_, well in front of the eyes, its anterior edge being nearly in line with the caudal margins of the paired tentacles; composed of twenty-eight or more short articles. Paired tentacles much shorter and also more slender; composed of about twenty articles. Palpi fused at base as usual; narrower distally than in _pigmentata_. The types are incomplete caudally; but the body is evidently slender. One specimen 8 mm. long consists of forty-three segments; and a second, somewhat thicker one, of nearly the same length consists of thirty-seven. The width is near 1 mm.

Type--M. C. Z. 2, 180.

_Hesperalia_ gen. nov.

Palpi thick, fused at base only to middle of length. Pharynx straight. Proboscis unarmed (?). Tentacles three, attenuated, more or less obviously jointed. Eyes two pairs; large. Tentacular cirri two pairs. Parapodia uniramous with setae all compound, or in the epitokous phase with long simple natatory setae in notopodia of middle region of body. Appendage of compound setate short, bidentate. Neurocirri present, thick, rounded. Notocirri on side of body above parapodia; filiform; more or less segmented. A large quadrate membrane or flap projecting from anterior edge of peristomium forward over caudal region of prostomium.

_Genotype._--_H. californiensis_ sp. nov.

_Hesperalia californiensis_ sp. nov.

Body rather stout for a syllid, more as in Hesionidae; broadest and deepest anteriorly, continuously narrowing caudal to the pointed posterior end. The color of the dorsum is blackish, with pale transverse lines in the intersegmental furrows and bisecting each somite which under the lens thus appears double. Parapodia and cirri typically pale fulvous and the venter either similar or approaching the dorsum in color. Prostomium very short, sunk in the first body ring and almost completely overlapped by the quadrate flap from the latter, this flap extending over the bases of the tentacles in the type. Palpi stout, presenting two main lobes fused to their apices or nearly so, and on each of these an ectodistal lobe projecting ventrocephalad, these distal lobes wholly free from each other. Tentacles appearing nearly smooth; tapered; the median exceeding the lateral in length. Eyes large; in type orange colored; the two on each side contiguous or nearly so; posterior ones nearer together, each beneath edge of the quadrate peristomial flap, while the anterior ones are in line with base of median tentacle. Tentacular cirri of same form as tentacles but longer. Neurocirri thick, short, distally rounded. Natocirri long, filiform, tapering distad, weakly ringed; showing a tendency to alternate in height on the sides of the body, the first being notably farther distad than the second, the third than the second and fourth, etc. Setae numerous; the appendage short, falcate, with tip simple, but a slender tooth near middle of curved edge. Segments short, crowded, near one hundred in number.

Length of type, 21 mm.; greatest width, 2.2 mm.

Type--M. C. Z. 2, 149.

Taken in August, 1914.

_Hesperalia nans_ sp. nov.

The type of this species is in the epitkous phase. The middle region of the body bears notopodeal fasciæ of long, fine, simple, natatory setae in addition to the compound neuropodials. The appendage of the compound setae differs from that of _californiensis_ in having the accessory tooth farther distad, well beyond the middle of the concave edge, whereas in the other species it is normally rather proximad of the middle. In the present species the prostomium is proportionately larger, less covered by the peristomial flap which does not extend over the base of the median tentacle. The palpi are not fused so far distad, being united only at base; they present below on each a large distal lobe similar to that in the other species. Eyes with prominent lenses; large; those on each side sub-contiguous. Median tentacle in line with the centers of the anterior eyes; short and pointed, shorter than the width of the prostomium. Paired tentacles a little shorter than the median; each attached in front of the median at a point midway between the latter and the anterior eye. Tentacular cirri much longer than the tentacles, attenuated distad, pointed. The notocirri are all similarly attenuated and run out to a rather fine point. Neurocirri very thick, conical, each with a black dot near middle. Contrasting with the preceding species in color in having the dorsum in general light, fulvous, in part slightly dusky, with a series of dark, blackish, transverse lines across dorsum, there being four somites between each two dark lines. The body is narrowed toward both ends; venter flat and dorsum strongly arched; hesioniform. Because of the broken condition of the type the number of segments is uncertain, but is near seventy-five.

Greatest width, exclusive of parapodia, 1.5 mm.

Type--M. C. Z. 2, 150.

Dredged August 27, 1917.

_Campesyllis_ gen. nov.

Like _Streptosyllis_ in having the pharynx strongly sinuous and unarmed and in lacking nuchal flaps such as characterize _Amblyosyllis_. It differs from the former genus in having only composite setae and in having these of the ordinary structure, the appendage of a simple, fringed form not covered by a membrane. Eyes two pairs instead of three. Tentacular cirri two pairs. These, as also the tentacles and notocirri, short, articulated. Neurocirri attached proximally.

_Genotype._--_C. minor_ sp. nov.

_Campesyllis minor_ sp. nov.

The type of this small form is only 2.5 mm. long. The pharynx is strongly sinuous. The palpi are contiguous throughout and are fused for most of length though a median furrow or sulcus above and one below run to base; projecting forward; together they narrow distad, with outline triangular; shorter than prostomium. Eyes two pairs, well separated, subequal, forming a nearly straight transverse row a little in front of the peristomium. Median tentacle attached far back between posterior eyes; short, a little exceeding prostomium and palpi together. Lateral tentacles also short, each attached at cephaloectal corner with the prostomium bulging forward between them. Tentacular cirri and notocirri also short, the latter in anterior region about equalling half the width of the body proper and not extending much beyond the tips of the setae; joints short, near fifteen or less in number. Neurocirri subcylindric, slender, reaching ends of parapodia. Setae transparent; end of shaft but little enlarged, its articular edge very oblique; appendage long and slender, the tip curved, the edge strongly fringed. Body ventrally flat, convex dorsally, strongly narrowed caudad.

Taken in a sabellid colony.

Type--M. C. Z. 2, 151.

NEREIDÆ

_Nereis latescens_ sp. nov.

Allied to _N. vexillosa_ (Grube) but a much smaller species readily distinguishable superficially through the presence of purplish markings on the prostomium and anterior segments, by the form of the appendages, and particularly by the presence on region V of the proboscis of a single large conical tooth such as is present in various epitokes. The prostomium is marked above by a large purplish area germinate by a narrow median longitudinal yellow line. Eyes black. On the anterior segments, above on each side a transverse purplish stripe along anterior and one along posterior border and across the dorsal region, a shorter but broader stripe a little in front of the middle of segment. The body otherwise yellowish. Eyes exceptionally large, and those of each side very close together. Tentacles close together, slenderly cylindrical, moderately narrowing distad, shorter than prostomium and not extending beyond end of proximal joint of palpi. Paragnatha in general as in _vexillosa_; area I with but a single tooth; II, III and IV with numerous teeth in a patch on each; V with a single exceptionally large tooth; VI with four teeth in a quadrangle; VII and VIII with teeth in a band across ventral and lateral surface in which the proximal ventral teeth are smaller than the distal as in _vexillosa_. Peristomium shorter than prostomium and than the next two somites combined; divided by a transverse furrow. Tentacular cirri short; the ventral ones subequal, less than half the length of the dorsals, which are also nearly equal to each other; more or less flattened; cirrophores short. A typical parapodium presents three stout conical lobes additional to the setigerous ones; of these the dorsal one in the anterior region is stoutest, but becomes more slender in the posterior region. Both notocirri and neurocirri proportionately very slender. Anal cirri about as long as the dorsal tentacular cirri, flattened.

Number of segments, sixty-two.

Length of types, 20 to 23 mm.

Type--M. C. Z. 2, 152.

Taken among hydroids.

_Nereis mediator_ sp. nov.

This species also resembles _N. vexillosa_, though apparently a normally much smaller form. It is, so far as evidence at present accessible to me indicates, distinguishable from that species in having a narrow band across the anterior border of the dental band of VII composed of much finer denticles instead of having the anterior teeth large and the posterior ones reduced. The paragnatha are fewer than in _vexillosa_, those of II, e. g., being in fewer (usually three), less oblique and more separated series and those of VI in all the typical specimens being three in a triangle or four instead of from six to nine or more in a crowded patch. No colored markings. The tentacles proportionately thicker and obviously closer together. Tentacular cirri shorter. Notocirral laminae of the middle and posterior regions much less elongate and flattened with their ventral conical lobe much more pronounced throughout, more as in the smaller specimens of _vexillosa_. Anal cirri short. Number of segments up to seventy.

Length, to 60 mm.

Type--M. C. T. 2, 153.

This is doubtless the same form as recorded by Dr. Moore from San Diego as _N. vexillosa_ in Proc. Acad. Sci. Phil., 1909, p. 244. It is undoubtedly close to that species; but as all the specimens which I have seen, and apparently also those studied by Moore, differ constantly in the features above mentioned from specimens of _vexillosa_ from more northern localities on the Pacific coast, etc., the form is maintained as distinct. A single heteronereis female is among the specimens from Laguna Beach.

LEODICIDÆ

_Leodice monilifer_ sp. nov.

Yellow in color. Body strongly narrowed caudad. Prostomium short and broad. The palpal lobes large and rounded, bulging conspicuously forward and ventrad; separated by a deep furrow. Tentacles in a slightly curved transverse line, the outer paired tentacle on each side lying a little farther forward than the inner. Ceratophores very short and not broader than bases of styles, exceeded by the first segment of style which about equals the next two in length. The styles in general strongly moniliform, the articles short and well rounded. The styles in types short but not in any case certainly complete; the number of articles present from nine to twelve. The peristomium much longer than the prostomium than which it is also clearly wider and higher; entire second somite very short, not more than one-fourth as long as I. Nuchal cirri short and conical, much shorter than the peristomium, transversely wrinkled or sometimes distinctly annulated. Notocirri slenderly conical, becoming more slender in posterior region as usual; with some weak encircling wrinkles but not distinctly divided into articles. Branchiæ begin as single filaments on IX or sometimes on VIII. Branchiæ of X each consisting of two filaments. The number in several of the succeeding branchiæ increases to three, then again falling to two, and, finally, the last eight pairs or so are again simple filaments. The last branchiæ in the type occur on XXXII. Anal cirri short, slenderly conical. Maxillae strongly chitinized; brown, with edges in part black. In maxillae II the right plate has six large teeth, the outer left plate four and the odd or inner left plate seven or eight. III with nine teeth or crenulatious. Number of segments in type one hundred and nine.

Length, 43 mm.; greatest width, exclusive of parapodia, 2.6 mm. An incomplete larger specimen has a width of 3.2 mm.

Type--M. C. Z. 2, 154.

Taken among holdfasts of kelp. (C. F. Baker, June 30, 1911.)

_Arabella lagunae_ sp. nov.

As compared with _A. attenuata_ Treadwell, this is a smaller species differing in appearance in being brown of a decided greenish tinge, excepting on the prostomium and at the caudal end. The prostomium is less narrowed cephalad, being more broadly rounded across anterior end. Median eyes not exceeding the lateral in size. Maxillae V represented by simple small hooks. IV with five teeth of which the most ectal (upper) is long and slender, the two next much shorter and finer and the two innermost closer together. III with fine teeth similarly arranged and formed. Maxillae II nearly symmetrical; the left one with seven teeth of which the most anterior one is much largest, the right with an additional small tooth in front of (ectad of) the large one; neither of the plates extending caudad of the anterior end of the dental series of I. I with seven or eight well developed teeth; the carriers very long and slender, black throughout. In the paraphodia the posterior lobe is well developed, stout and conical, distally somewhat blunt or rounded, extended ectad or caudoectad and is always shorter than the setae. Setae all simple, limbate, in a single series of mostly six in the middle region of the body. Setae with the usual double or sigmoidal curve over the limbate part, the first bend or geniculation unusually strong, angular; tip becoming fine and hair-like. Body tapering caudad, pointed at the posterior end, ending in two blunt lobes. Number of segments in the type one hundred and ninety-one.

Length, 46 mm.; width, exclusive of parapodia, 2 mm.

Type--M. C. Z. 2, 155.

Taken at the shore "under rocks."

_Arabella mimetica_ sp. nov.

Resembling the preceding species though smaller and more slender. Superficially differing obviously in the form of the prostomium which is much more narrowed distad and is neither depressed nor furrowed either dorsally or ventrally. Eyes smaller, obscure. Maxillae resembling those of the other species in general, but differing strongly in the second pair in which the right plate, instead of being symmetrical with the left one, is decidedly long and extends far proximad along the dental line of I and bears about fifteen teeth as against only six on the left one and eight on the corresponding plate in _lagunae_. Maxillae I on right side with nine teeth, on left apparently with seven. Maxillae III with teeth in arrangement as in _lagunae_ but only four in number and different in all being blunt and shorter. IV as in the other species but teeth four instead of five. The number of segments in the type is near one hundred and sixty-five.

Length, 40 mm.; width, 1.1 mm.

Type--M. C. Z. 2, 156.

Taken among holdfasts of kelp. (C. F. Baker, June 30, 1911.) Also a small specimen taken August 2, 1917, by Prof. Hilton.

_Biborin_ gen. nov.

Setae all simple, limbate, well developed. First two segments achaetous. Eyes none. Maxillae absent, but the mandibles normally developed, the wall of the alimentary canal opposite the latter simply thickened. Notocirri rudimentary.

_Biborin ecbola_ sp. nov.

The type as preserved is greyish brown of a dull bluish green cast. A note with the specimen also states that it is greenish in life. The body is strongly attenuated and pointed caudad, more moderately cephalad. The prostomium larger than wide and somewhat longer than the first two segments; subconically narrowed distad, apically rounded, flattened dorsoventrally. The two achaetous segments subequal in length or the second slightly longer, not produced forward below. Mandibles short and broad, not toothed, the edges meeting at an acute angle in front; the caudal stems shorter behind point of separation than the blades in front of this point, rather slender, blunt behind. Posterior lobes of parapodia subcylindrical, a little conically narrowed distad but with apex well rounded, extending ectad or caudoectad; in middle region of body reaching to or a little beyond middle of longer setae, the setae relatively shorter in anterior region. Setae all simple and limbate with the usual double curve, the first curve or angulation obviously less marked than in _A. lagunae_, which form this species superficially resembles. Number of segments in type, two hundred and seventy-seven.

Length, 92 mm.; width without parapodia, 2.2 mm.

Type--M. C. Z. 2, 157.

Taken among Phyllospadix, September 17, 1917.

GLYCERIDÆ

_Glycera exigua_ sp. nov.

A small species easily recognizable among the known forms of the California coast by the character of the parapodia. Each of these present three lips, two anterior and one posterior; all three lobes triangular, pointed distad, with the posterior one fully equalling the other two in length. The neurocirrus is also triangular in outline. The natocirrus is reduced to a small rounded or nodular form slightly above base of parapodium. Branchiæ simple cylindrical filaments, each attached toward distal end of parapodium above as in _G. alba_ and _G. longipinnis_; the first occurring on or near somite XXX, short, in actual length not greater than parapodium exclusive of terminal lips and falling much short of reaching ends of setae; absent from last twelve segments or so and those just in front of this caudal region much reduced. Prostomium of usual general form; consisting of fourteen or fifteen rings. Proboscis long; weakly longitudinally ridged and densely finely papillose. Body strongly narrowed from the anterior region caudad, the caudal end slenderly pointed. Segments biannulate. Number of segments in the type near one hundred and thirty.

Length, 26 mm.; width, 1.5 mm.

Type--M. C. Z. 2, 158.

Balboa, December 26, 1917.

_Glycera basibranchia_ sp. nov.