408 University of California Publications in Zoology [Vol.16 



the felty layer. It has a subterminal enlargement and ends in a 

 blunt tip. 



Occurrence. — The only specimen, the type, was taken at Station 

 LXV, 32° 42f7 N, 117° 13:4 W, off Coronado, California, from sandy 

 bottom at a depth of 6-5 metres, on July 20, 1901. 



3. Aphrodita solitaria, sp. nov. 

 PI. 37, figs. 81, 82; pi. 33, figs. 27-38 



Comparisons. — The description of Aphrodita solitaria is based on 

 a single specimen that had been previouslj' identified by Treadwell 

 (1914) as Aphrodita refulgida. It differs from the latter in some 

 essential characteristics. The shape of the body is narrower and 

 more attenuated at the anterior and the posterior extremities. The 

 brilliant, iridescent lateral fibers, which are conspicuous in A. reful- 

 gida, are absent in this species, and their place is taken by short, 

 colorless fibers. The neurosetae of A. solitaria have strongly pillose 

 tips, while those of A. refxdgida are perfectly smooth. Furthermore, 

 the shape of the prostomium and of the fimbriated organs differs from 

 that in A. refulgida. 



Description. — The shape of the body is narrowly ovate. The 

 length of the body is 34 mm. The greatest width of the body, between 

 segments 13 and 15, is 23 mm. from tip to tip of the setae, and 10 mm. 

 between parapodia. The body tapers very gradually towards both 

 ends. Tlie posterior segments decrease abruptly in width, and the 

 last 12-13 caudal segments form a narrow portion about 0.5 mm. in 

 width. The specimen has forty segments, which are well marked 

 veutrally. The ventral surface is graj^ (in alcohol), densely studded 

 with papillae. The latter are prominent, with capped tips (pi. 33, 

 fig. 22). The dorsum is arched. The dorsal setae are parth' con- 

 cealed by the felty layer and hy the adherent debris. 



The prostomium (pi. 33, fig. 27) is slightl.y wider than long, and 

 is attached to the peristomium by the narrow isthmus, which is about 

 one-sixth of the width of the prostomium. The ocular hemispheres 

 are inconspicuous, each having a pair of minute eye-spots. The 

 median tentacle consists of a prominent cirrophore and a style three 

 times the former. The length of the palpi is five times that of the 

 prostomium. The palpi are comparatively stout, gradually decreasing 

 in diameter towards their distal ends, grooved longitudinally, and are 

 covered with fine sensory cilia, visible only under high magnification. 



