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.
Resembles exigua in having the branchiæ in the form of a series of single, simple filaments but readily distinguished in having each branchia attached at base of parapodium on the dorsocaudal surface just ectad of the notocirrus instead of at the distal end above. The branchiæ begin on the twenty-ninth setigerous somite and continue to about the one hundred and twenty-ninth, decreasing in size at the two ends of the series. In the middle region they are cylindrical, distally rounded, and transparent, and at most do not surpass the distal end of the parapodium, most of these being obviously shorter than this in the preserved specimen. Also decidedly different from exigua in having four lobes at the distal end of each parapodium, two postsetal and two presetal. These are narrowly triangular, distally pointed, with the presetal lobes thicker and more conical and decidedly longer than the postsetal. The short, distally rounded notocirri are attached at the base of the parapodia above in the angle between the latter and the body wall. Neurocirri distally subcylindric, resembling the distal parapodial lobes. The prostomium distinctly ringed to near middle, the basal half showing five rings while the distal half in the type is only vaguely annulate, though with indications of apparently seven nearly fused rings, making the total number twelve. Proboscis long, densely papillose. Type incomplete caudally; one hundred and forty-five segments retained.