238 University of California Puhlicatioiis in Zoology [Vol. 13 



of the head. Posterior eyes about one-quarter of the diameter of the 

 anterior ones. Median and lateral tentacles about equal in size, length 

 about 5 or 6 times that of head, faintly con.stricted at intervals but 

 not regularly jointed, with granules of brownish pigment arranged 

 in more or less of a segmental pattern along anterior faces of each. 

 Tentacular cirri two pairs, dorsal ones one-quarter longer than 

 antennae, and much stouter. Ventral ones slender, scarcely half the 

 length and diameter of the dorsal. 



First somite with dorsal cirrus larger than dorsal tentacular cirrus, 

 later ones progressively smaller but after about somite 10 the size is 

 uniform to the posterior end. AH cirri marked with pigment in same 

 manner as the antennae. 



Anterior parapodia (fig. 4) with narrower dorsal and broader 

 ventral lip, the latter postsetal. A single aciculum arises between the 

 two. No distinct ventral cirrus. Dorsal cirrus more or less lobed but 

 not articulated. Setae all compound with very short terminal joints. 



Throughout median region the two setae lobes are nearly alike in 

 size and form (fig. 5) and the tuft of compound setae arises between 

 them. Dorsally, from the end of an inconspicuous squarely truncate 

 uotopodium arises a tuft of long natatory setae, in length equal to 

 the transverse diameter of the body. Each has a parallel-sided, liat 

 basal portion sharply ruled by parallel longitudinal lines. This por- 

 tion widens toward the end to about twice its original diameter, 

 becoming at the same time very much thinner. None was entire at 

 the tip, but apparently they end in a sharp point. A large aciculmn 

 extends into the notopodium, and surroimding it, but not penetrating 

 the surface, is a tuft of about 15 long, slender, curved needle-like 

 setae. Compound setae are similar in form to those in the anterior 

 region, but do not protrude quite so far from the surface. Dorsal 

 cirrus relatively much shorter than anteriorly. 



Posterior parapodia (fig. 6) in general form like the anterior ones, 

 but with larger dorsal cirrus which may show an indication of jointing. 

 Compound setae small, basal portion expanded at end and covered 

 with minute spines. Terminal portion with two sharp teeth (fig. 7). 



Collected at Bonito Point, near the outer end of the entrance to 

 San Francisco Bay. 



Zoological Laboratory, Vassar College, Poughlceepsie, Neiv Yorlc. 

 Transmitted April 13, 1914. 



