196 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 19 



distally slightly club-shaped (Fig. 8). Posterior segments have simple, 

 slender, superiormost setae, occurring singly in a fascicle; each has widely 

 spaced denticles along the cutting edge. The body tapers posteriorly and 

 terminates in a pair of long, cirriform, pygidial appendages. 



Eusyllis transecta differs from other species of the genus in its pharyn- 

 geal formula ; it has falcigerous setae which are distally entire. It has been 

 recovered only from the San Pedro shelf, in 14 fnis, where the trawl took 

 algae, sand, rock and ascidians. 



Genus Sphaerosyllis Claparede, 1863 



Sphaerosyllis californiensis, new species 



(Plate 3) 



Collections: Sta. 5028 (66, TYPE); Sta. 4806 (57); Sta. 5102 

 (100^). 



1 he body is small, depressed, linear and trim in appearance. Length 

 is about 3.0 mm, width 0.5 mm, and segments number 32 to 34. The 

 dorsal surface is papillated and convex ; the ventral surface is nearly 

 smooth and flat. The quadrate prostomium (Fig. 1) is wider than long, 

 has a pair of broad palpi completely fused, and a slight, midfrontal emar- 

 gination. The two pairs of eyes are in quadrate arrangement, with the 

 two on a side nearly touching ; the anterior pair are slightly the larger. 

 Prostomial antennae resemble one another; all are short, clavate, their 

 length less than that of the prostomium ; the median one is inserted 

 behind the middle of the lobe, and the paired ones are in front, within the 

 anterior eyes. 



The proventriculus, seen through the body wall (Fig. 1 ) , is short, 

 extends through setigerous segments 3 to 5, and is crossed by about 13 or 

 14 muscular bands. The anterior end of the pharynx terminates in 10 

 soft, widely spaced, small papillae ; a conspicuous, blunt yellow, middorsal 

 tooth is embedded in the pharyngeal wall. 



The first segment is reduced to a lower lip or peristomium and a pair 

 of bases for the tentacular cirri, best seen in ventral view ; they project 

 laterally, and in dorsal view are seen in line with the prostomial eyes. 

 These cirri, and all other dorsal cirri are clavate, with a thick, bulbous 

 base and a terminal digitate lobe exceeding in length that of the base. 

 The second parapodia lack dorsal cirri, but all others have well developed 

 ones. 



Parapodia (Fig. 3) are similar throughout, but diminish in size poste- 

 riorly. Dorsal and ventral cirri are clavate, and taper distally. A superior- 

 most, nearly straight acicular spinelike seta is present from the first, and 



