62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



small lobe at its junction with the parapodium, and an elevated flange 

 a short distance from its articulation with the ramus (pi. 13, fig. 158). 



A single specimen from 770-37 differs from others in that its peri- 

 stomial cirri are checkered. In other respects it resembles S. ftisca. 



The specimens identified as S. fusca Johnson vary considerably in 

 certain respects. The length ranges from 40 mm (adult female from 

 28-33) to 110 mm (745-37). The degree of tuberculation on the elytra 

 is variable, as mentioned above ; the surface of the elytra is pale in some, 

 and encrusted with rust-colored particles in others. All agree, however, 

 in having similar parapodial parts as described above, and the first 

 elytrum is ellipsoid. 



The relation of S. fusca Johnson to S. variabilis colorata Monro is 

 apparently close. It is only by resort to microscopic parts that notable 

 differences are observable. 



Distribution. — ^Washington, south to Panama; Galapagos Islands. 

 Intertidal to 46 fms. In root masses of eel grass; under stones. 



Sthenelais verruculosa Johnson 



Plate 14, Figs, 167-175 



Sthenelais verruculosa Johnson, 1897, p. 187, pi. 9, fig. 62, pi. 10, fig. 

 65; Treadwell, 1914, p. 184; Berkeley, 1923, p. 216. 



Collections.— 2^1 -3A, 888-38, 893-38, 894-38, 897-38. About 27 

 specimens. 



Length over 75 mm; width without 4.5 mm, with parapodia 8.5 

 mm; with setae 13 mm at fifteenth segment. No specimens are posteri- 

 orly complete. Dorsum completely covered by elytra. They are fringed 

 on their outer margins; the surface is finely punctate, and marked with 

 a broad greenish gray crescent on the median and posterior third of the 

 scale, approximately marking the line where the preceding elytrum over- 

 laps it. The ventrum of the body is finely and closely pustuled, the 

 papillae similar to those that cover the surface of the elytra. 



The prostomium somewhat resembles that in S. fusca (see above) 

 except that the anterior pair of eyes is visible from the dorsum, and only 

 partly concealed by the antennal flanges. The posterior eyes are inserted 

 somewhat behind the lateral bases of the median antenna. The latter 

 has broad, lateral expansions (pi. 14, fig. 170). Palpi are white, long, 

 slender, extending distally to the tenth setigerous segment when directed 

 posteriorly. 



