PUGET SOUND NEMERTEANS. 215 



Internal Anatomy. Nephridial system with numerous 

 efferent ducts opening dorsally to the nerve cords. In one sec- 

 tion two ducts occurred, one sHghtly dorsal to the other. 



Habitat and Distribution. Under stones and in sand be- 

 tween tides, Kihsut Harbor, and Bremerton. Not taken in 

 Alaska. 



15. Lineus sp. — . 



This species, which appears to be new, was found among a 

 mass of hydroids that had been preserved in formalin. The 

 single specimen measured 5.2 cms. by 5 mms. ; it was an entire 

 worm. Color smoky black with greenish tinge on dorsum, 

 gray -brown ventrally. 



Internal Anatomy. Cutis richly supplied with gland cells 

 of which two kinds occur, one staining with haematoxylin, the' 

 other with congo-red. In this respect the cutis is similar to the 

 epithelium. 



Habitat and Distribution. Among hydroids {Diphasiar. 

 about Port Townsend. 



16. Cerebratulus marginatus Renier. 



I have referred to this species a smoky black form that occurs 

 abundantly in the sand between tides at Port Townsend and Brem- 

 erton. Most of the specimens differed from the Neapolitan form 

 figured in Burger's monograph, in lacking the white coloration 

 on the posterior extremity, and the white rims to the cephalic fur- 

 rows. As the specimens showed variation in this regard, some 

 approaching quite closely the typical form, and as the internal 

 anatomy is indistinguishable from that of specimens from Naples, 

 I have referred this form to C. maj^ginatus. 



17. Cerebratulus sp. 



Portions of a very large dark form with flesh-colored lateral 

 margins were obtained. Some of the fragments in alcohol 

 measure nearly 20 mms. in diameter. In internal anatomy it 

 seems to approach C. marginatus; the only noticeable point 

 of difference appears to be that the cephali: slits cease at least 



