1912. 



NATURAL SCIENCES OF PHILADELPHIA. 



481 



fig. 31) to form the single short, female duct, the vagina, which opens 

 to the exterior immediately behind the arc of the vasa deferentia. 



Genus EURYLEPTA Ehrenberg, 1831. 



Pharynx cylindrical, about 5 pairs of intestinal branches without 

 anastomoses. Male sex opening beneath base of pharynx. 



Eurylepta aurantiaca sp. nov. 



This species is fairly common in Monterey Bay and the neighboring 

 coast where it occurs under stones or crawling along the bottom in 

 comparatively shallow water. It is sluggish in its movements and 

 clings most tenaciously when an attempt is made to remove it. 

 The largest specimen is broadly oval in outline (PI. XIV, fig. 18) 

 and measures 15 mm. in length by 10 mm. greatest diameter. Gen- 

 erally speaking, the color of the dorsal surface is yellowish-pink or 

 salmon tint except along the mid line Avhere a bright pink streak 

 extends from the eyes to the posterior end of the main gut. Minute 

 Avhite specks are uniformly distributed over the entire dorsal surface. 

 On the ventral side of the animal pigment is lacking, and the opaque, 

 white somatic muscles are of such thickness that they wholly obscure 

 all of the internal organs. 



The ventral sucker is slightly behind the middle of the body. The 

 mouth (PL XIV, fig. 18) is placed somewhat less than one-sixth the 

 length of the body from the anterior margin of the body. The 

 penis is directed forward. 

 Nuchal tentacles are lacking, 

 and the marginal tentacles 

 (text fig. 8) are rather short, 

 stout outgrowths that, when 

 the animal is at rest, are 

 folded back on the dorsal 

 surface. Numerous eyes are 

 distributed on the tentacles 

 in two distinct clusters with 

 approximately 70 eyes in each, 

 while two fairly well-defined 

 oval groups, each with about 

 50 ocelli, occur dorsal to the 

 brain. 



The mouth (PI. XIV, fig. 18) ' 



opens into a spacious pharynx, Fig. 8. — Eyes of Eurylepla aurantiaca. 

 appearing like an inverted 

 shield in outline, with a length equalling one-sixth that of the body 





