348 PROCEEDINGS OF THE ACADEMY OF [June, 



rounded distal end and scarcely excavated base; on middle segments 

 larger, more broadly ovate, with bluntly pointed tips and nearly 

 straight symmetrical bases; while posteriorly they become again 

 smaller and tend toward a cuneate form. They all exhibit strongly 

 marked internal striations arranged in a partly bipinnate, partly 

 radiate pattern. On some specimens the styles are contracted and 

 much thicker, the anterior ones being nearly cylindrical, and all are 

 opaque and of a more or less deep brown color. Greatly extended speci- 

 mens have the notocirri all erect and widely separated. 



Aciculum single, rather slender, of the form usual in the genus, with 

 the bluntly pointed tip projecting slightly from the notch. Setae 

 (PI. XVI, fig. 30) arranged in the usual fan-shaped vertical fascicles 

 of one series, of a rather small number, as follows in the type: on X 

 7 supra- and 5 subacicular, on XXV 5 + 11, on L 9 + 11, on LXXY 11 

 + 12, on C 7 + 14 and on CLXX 14 in all. They have remarkably 

 long, slender shafts with slightly enlarged symmetrically cleft ends 

 forming the socket, each side of which is prolonged obliquely into a 

 prominent elongated tooth flanked on each side by a fringe of delicate 

 spinules. Appendages (fig. 30) rather short, usually one-third to one- 

 half depth of neuropodium, but on one specimen (station 4,431) rather 

 longer, broad at base and tapered and gently curved to a delicate 

 tip, the marginal denti dilations and oblique striations fine but distinct. 



Proboscis of a cotype protruded 2.5 mm., .4 mm. in diameter at distal 

 end, terete, gradually increasing in diameter distally, the entire surface 

 covered so thickly that they touch each other with crowded, granulated, 

 slightly flattened, rounded papillae, at least three irregular circles of 

 which at the distal end are of much larger size. 



Color of type (female filled with eggs) faded to a uniform pale greenish 

 drab or light olive. Another specimen is nearly uniform brown and 

 still another pale yellow with a thin brown line of granules across each 

 segment and the head, tentacular cirri and parapodial cirri deep 

 brown with aggregations of similar granules. 



One specimen from each of the following stations: 4,418, off Santa 

 Barbara Island, April 12, 238 fathoms, gray sand ; 4,420, off San Xicolas 

 Island, April 12, 291 fathoms, gray mud, rocks; 4,430 (type), off Santa 

 Cruz Island, April 14, 197 fathoms, black sand and pebbles; 4,433, off 

 Santa Rosa Island, April 15, 265 fathoms, gray mud. 



This species belongs to the bilineata-gracilis group and, with the 

 exception of the Hawaiian species E. navaica Kinberg, appears to be the 

 first of that group to be described from the Pacific. As is the case 

 with E. gracilis Verrill, specimens in different states of contraction differ 

 considerably in appearance. 



