176 PROCEEDINGS OF THE ACADEMY OF [Sept., 



•canal. The ductus leaves the anterior end of the seminal vesicle, 

 bends backward, then sharply downward and forward again to enter 

 the base of the short, conical penis. Near the base of the penis 

 this canal is joined by' a very short duct leading from the granular 

 gland, a small oval body that to a certain extent occupies a space 

 between the penis and the seminal vesicle. 



The ovaries are dorsal and connect with the uteri by means of 

 ducts that very plainly anastomose. The uteri (PL XV, fig. 17) 

 have been traced backward to a point about opposite the end of the 

 main gut and forward to a point opposite the mouth. At the level 

 of the female reproductive pore the uteri converge (PL XVII, fig. 36) 

 and unite with a short median canal, the vagina, which leads 

 anteriorly to the exterior at a point immediately posterior to the 

 seminal vesicle. 



Family ETJRYLEPTIDiE Lang, 1884. 



Body oval or elliptical, with or without solid marginal tentacles. 

 Mouth near anterior end of body. Pharynx tubular. Main gut, 

 long and narrow. Male apparatus simple. Eyes in brain region 

 and tentacles. 



Genus STYLOSTOMUM Lang, 1884. 



Body smooth. Mouth and male sex pore communicating with a 

 common atrium. Pharynx cylindrical. Gut pouches not anasto- 

 mosing. Anterior median gut branch lacking in region of pharyngeal 

 pouch. Female sex apparatus ventral to base of pharyngeal pouch. 

 Tentacles very rudimentary. 



Stylostomum lentum sp. nov. 



This species is represented by six individuals taken near Monterey, 

 Calif., at low-tide level. It is a sluggish animal and seemingly 

 incapable of swimming. The ground color ©f the dorsal surface is 

 orange. A somewhat darker shade occurs along the mid line from 

 the eyes to the posterior end of the mid gut, but laterally this patch 

 becomes lighter and near the margin of the body sends out ray-like 

 expansions that alternate with irregular streaks of bright yellow. 

 Minute white specks are scattered over the entire dorsal surface. 



The largest specimen measured 9 mm. in length by 5 mm. in width, 



and was elliptical in outline (PL XIII, fig. 16). The mouth is 



situated immediately behind the brain about one-tenth of the length 



of the body from the anterior end and, as in other species of the genus, 



lso as the male reproductive opening. The penis is directed 



Short, blunt, and somewhat rudimentary tentacles (PL 



