COE : NEMERTEANS OF WEST AND NORTHWEST COASTS. 271 



tively slender in its anterior and posterior thirds, but was broad in its 

 middle portions. Head rather slender, with shallow transverse 

 lateral grooves. 



Proboscis sheath thick, of interlaced longitudinal and circular 

 fibers, extending to posterior extremity of body. Proboscis missing. 

 Cephalic glands well developed, situated mostly in ventral half of 

 head. Submuscular glands limited to narrow area just beneath 

 lateral margins of body. 



Nei)hridial tubules voluminous, as in A. paei/iciis, except that 

 efferent ducts were very long and extended far posteriorly beneath 

 the lateral nerves before opening on ventral surface of body. 



Numerous slender diverticula of the intestinal caecum extend for- 

 ward to nephridiopores ; pylorus opens into intestine far back of 

 anterior sexual glands. 



A moderate amount of parenchyma lies in the esophageal region, 

 but becomes increased to an unusual degree in intestinal region. 

 Brain and cerebral sense organs as above. 



Another specimen from which the proboscis was likewise missing, 

 but which was indistinguishable fi-om A. pacificus in other features 

 of internal anatomy and in external characters after preservation 

 was dredged in 9 fms. in the Gulf of California by the Albatross 

 (sta. 2826, Lat. 24° 12' N., Long. 109° 55' W.). The water tem- 

 perature here is about 73° F. in April and rises considerably 

 higher in midsummer. It seems reasonable on this account to admit 

 the possibility that this specimen actually belongs to a species dis- 

 tinct from A. pacificus found in the colder waters off the coast of 

 California and in Bering Sea, and that living individuals or the 

 structure of the proboscis would reveal marked specific differences. 



67. Amphiporus occidentalis, sj». nov. 

 PL 20, fig. 121. 



The two preserved specimens are both about 25 mm. in length 

 and 3 mm. wide. Body broadest posteriorly, only slightly flattened, 

 much as in A. angulatus; head separated from body by transverse 

 grooves. 



Color. — One of the specimens was thickly mottled and blotched 

 with dark reddish brown on a ])ale ground color throughout whole 



