coe: nemerteans of west and northwest coasts. 223 



Alaska fully 40 cm. in length. The evidence from these observa- 

 tions seems to indicate, therefore, that increase in size of individ- 

 uals of this species is to some extent correlated with (a) increase 

 in number of ocelli, (b) increase in size of basis and stylets, (c) 

 increase in number of lateral pouches, and ((7) increase in number of 

 stylets in each pouch. 



Additional notes by Professor Wilson on specimens collected at 

 Pacific Grove, Cal., are as follows : — Body dark chocolate brown, 

 with bluish tinge above and yellow beneath. Head well differenti- 

 ated by color and by lateral constrictions during movement. An 

 irregular row of 10 to 12 or more ocelli on each antero-lateral mar- 

 gin of head, and a posterior pair of clusters each with 7-12 or more 

 ocelli near the brain. The posterior clusters are surrounded by the 

 yellow color of ventral surface, which in this region encroaches on 

 the brown color of dorsal surface, so that the broAvn color of head is 

 connected with that of the body by a comparatively narrow band 

 of brown color. Very common everywhere at Pacific Grove under 

 rocks and among seaweeds. Length 6-11 cm.; width when ex- 

 tended 2 mm. 



Habitat. — This is a very restless nemertean, and on cloudy days 

 was frequently found crawling about on the beach between tides. 

 It occurs from low tide well up toward high-water mark in every 

 variety of situation — under stones, among seaweeds, barnacles, 

 mussels, etc. The worms are remarkably tenacious of life, and will 

 live under ai)i)arently most unfavorable conditions. They are 

 voracious feeders and were often found with partially swallowed 

 chaetopods. 



In the collections at hand, specimens are represented from the 

 following localities : 



1. A number of specimens collected by Mr. Griffin at Port Town- 

 send, Washington. 



2. One specimen collected by Mr. Shearer at Albert's Head, 

 Vancouver Island, B. C. 



3. Several specimens from Sand Point, Ilumbolt Bay, Alaska, 

 collected by the U. S. F. C. S. Albatross. 



4. Unalaska Island. W. H. Dall. 



5. Atka Island, Aleutian group. U. S. F. C. S. Albatross. 



6. Adakh Island, Aleutian group. U. S. F. C. S. Albatross, July 

 2, 1893. 



