182 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Harmothoe hirsuta, sp. nov. 



Plate VI, Figs. 27, 28, 29; Plate VII, Fig. 38; Plate VIII, Figs. 53, 53a, 



53*, 53^- 



Form short and broad, rather thin dorsoventrally, and only slightly tapered 

 at posterior end; elytra not covering last four or five somites. 



Prostomium typical for the genus, broader than long, with two well defined 

 acuminate " peaks" (fig. 38); deeply incised for insertion of base of tentacle, 

 which is distinctly at a higher level than the antennae. Basal joint of tentacle 

 thickened. Eyes four, anterior pair slightly the larger, laterally placed 

 about half-way the length of prostomium, where it is widest. Posterior pair 

 set far back, close to base of prostomium. 



Antennae less than one-third the length of the tentacle, and about one-halt 

 its thickness; their basal joints short, and not much thicker than the terminal 

 joint, heavily pigmented. Terminal joints of all the cirri, both dorsal and 

 ventral, more or less thickly beset with long, villous papillae, among which 

 extraneous matter has usually gathered in abundance. All dorsal cirri, in- 

 cluding tentacle (but not the antennae), with a broad zone of dark pigment 

 at or near the proximal end of the distal segment. Palpi longer than any 

 of the cirri, gently tapering to a fine point; minutely papillated, terete. 



Parapodia (fig. 53) with large, bristling fascicles of setae, those of dorsal 

 ramus usually loaded with fine sediment. Dorsal ramus of medium size, but 

 its setae very numerous, long, and stouter than those of ventral fascicle, 

 with long series of serrations (fig. 53c). Ventral setae (fig. 53a) long, 

 slender, numerous, toothed at tip, serrated for a considerable portion 

 of their length; decreasing in length and size ventralward (figs. 53a, b). Both 

 dorsal and ventral ramus with a finger-like terminal process. 



Elytra (figs. 27-29) curiously ornamented with 4-6-pronged tubercles, 

 these scattered over the whole surface in young elytra, but in old 

 ones (except first pair) limited mainly to'posterior and lateral margin, where 

 they attain a very large size. Elsewhere they are much smaller. Each 

 tubercle arises from a "space," which is bounded by thickened walls (fig. 

 29). Elytra also fringed and partly clothed with long filiform papillae, or 

 "cilia," like those of dorsal cirri. 



Number of somites, 37 to 40. Pairs of elytra, 15, borne on somites 2, 4, 

 5, 7 23, 26, 29, 32. 



Measurements. — Length of large specimen, 23 mm.; width of same, 6 mm. 



Found at San Pedro in considerable abundance crawling 

 on under side of stones at low-water mark and at moderate 

 depths (3-4 fathoms). Its setae, cirri, and curiously tuber- 

 culated elytra are usually coated with minute sediment. 



This species bears a very close resemblance to Polyno'e 

 polytricka of the Caribbean region, first described by 



