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VOL. 86 



individual of this species looked somewhat like Stylochus inhnicus 

 Palombi but was easily distinguished by the quicker movements and 

 the fact that when crawling the anterior end was wider than the pos- 

 terior, so that the shape of the body was oval. The largest individual 

 was 18 mm long and 5 mm wide when extended. The color of the 



FicnnB 22. — Discocelis grisea, new species : Enteron at left, gonads at right, e, Ejes ; 

 en, enteron ; g. gonads ; m, mouth ; p, pharynx ; pe, penis ; ag, shell gland ; sv, seminal 

 vesicle; u, uterus; ug, uterine glands; vd, vas deferens; <f, male opening; $, female 

 opening. 



dorsum was gray, with faint radiating light streaks (nerves) and a 

 light median band (pharynx, etc.) through the middle half. The 

 ventrum was cream-color, with white genitalia showing through. At 

 times the worms swam about by waving the sides of the body. There 

 were no nuchal tentacles, but the tentacular eyes were in low tubercles. 



