68 University of California Publications in Zoology [Vol. 18 



by the absence of eye-spots and by the shape of the setae. In Eury- 

 tJioe pacifica the ventral setae are more strongly bifurcated with a 

 few serrations on the concave side of the longer fork. 



The habitat of the worm is unknown. Most probably it comes 

 from the vicinity of San Diego. 



4. Euphrosjme kyllosetosa sp. no v. 



PI. 5, figs. 24-31 

 Diagnosis. — Body ovate-oblong. Dorsum arched and covered with 

 branchiae and setae. Naked mid-dorsal line about one-fifth of the 

 width of the body. Caruncle bilobed, long, extending to the fifth 

 segment. Branchiae 6 to 7 pairs on each segment. Dorsal setae of 

 two kinds, unevenly bifurcate smooth ; and strongly bifurcate serrate. 

 Description. — It is a comparatively small worm measuring 11 mm. 

 in length and 6 nnn. in width including setae. The respective num- 

 ber of segments in the two specimens, type and cotype, are 31 and 32. 

 The dorsum is convex, densely covered with branchiae and setae, 

 except a narrow mid-dorsal line about one-fifth of the width of the 

 body which is bare. The prostomium is coalesced with the peris- 

 tomium and is partly concealed by the long bilobed caruncle dorsally. 

 The crest of the caruncle (pi. 5, fig. 24) is marked by longitudinal 

 grooves. The median tentacle consists of a long basal portion and a 

 style of equal length. The whole tentacle is about one-half of the 

 length of the caruncle. At the base of the tentacle is a pair of eyes. 

 The caruncle is comparatively long, with its free end extending to the 

 fifth segment. The palpi are broad, flattened pads (pi. 5, fig. 25). 

 continuous by their anterior ends with the peristomial parapodia. 

 The mouth is bounded anteriorly by the palps, and posteriorly by 

 a V-shaped furrowed lip. The buccal region extends to the fourth 

 segment. The ventral eyes (pi. 5, fig. 25) are small. The biramous 

 parapodia are of the kind characteristic to the genus. The notopodia 

 are sessile, merging into the dorsum; the neuropodia lateral, slightly 

 projecting lamellae. The cirri are about equal to the gills in length, 

 stout, slightly tapered. The notocirrus is situated mediad of the 

 setae palisade and a little anterior to the branchiae. The lateral or 

 middle cirrus is in line with the notocirrus and is between third and 

 fourth gill-trunks, on the anterior segments, between the second and 

 third gill-trunks (counting from the dorsum). The neurocirrus is 

 similar in shape, situated within the postero-ventral margin of the 

 neuropodial fascicle of the setae. 



