coe: nemerteans of west and northwest coasts. 205 



Color. — Living specimens collected at Sitka, Alaska, were brown- 

 ish in color throughout the whole body. As a rule they are of a 

 paler brown than individuals of C. ^narginatus^ which they some- 

 what resemble in color. Ventral surface is pale brown, as are also 

 the thin lateral margins of body. They are decidedly paler in color 

 than individuals of C. herculeus, and the shape of the body and the 

 activity of the worms will readily distinguish these three species, 

 which are all found in the vicinity of Sitka, Alaska. 



Specimens preserved in alcohol lose their original coloring in a 

 few months. The form and size of the body with its remarkably 

 thin lateral margins will, however, readily serve to distinguish pre- 

 served specimens from those of any other species yet recorded from 

 the region. 



Habitat. — Collected on the Harriman Expedition in hard mud at 

 low water, Sitka, Alaska. Dredged by the Albatross in the follow- 

 ing localities : 



1. Sta. 3173. Off Central California (Lat. 38° 19' N., Long. 128° 



14' W.) in 62 fms., mud. Bottom temperature 48° F. 



2. Sta. 2872. Off Cape Plattery, Washington (Lat. 48° 17' N., 



Long. 124° 52' W.) in 38 fms., gray sand. Bottom tem- 

 perature 45.5° F. 



3. Sta. 3068. Puget Sound, Washington (Lat. 47° 35' N., Long. 



122° 27' W.), in 135 fms., green mud. 



4. Sta. 3216. South of Alaska Peninsula (Lat. 54° 20' N., Long. 



163° 37' W.) in 61 fms., black sand and mud. 



5. Sta. 3311. Bering Sea, near Unalaska Island (Lat. 53° 59' N., 



Long. 166° 29' W.), in 85 fms., green mud. Bottom temper- 

 ature 41° F. 



6. Sta. 3313. Bering Sea, near Unalaska Island (Lat. 54° 01' N., 



Long. 166° 27' W.), in 68 fms., tine black sand. Bottom tem- 

 perature 43° F. 



7. Sta. 3314. Bering Sea, near Unalaska Island (Lat. 54° 02' N., 



Long. 166° 32' W.) in 74 fms., black sand. Bottom temper- 

 ature 42° F. 



8. 3521. Bering Sea, north of Pribilof Islands (Lat. 59° 09' N., 



Long. 170° 48' W.), in 40 fms., green mud and fine sand. Bot- 

 tom temperature 31.9° F. 

 ?[9. Plover Bay, Siberia. Proboscis only, but its large size indicates 

 that it may have belonged to an individual of this species.] 



