OYSTERS AND SMALL CLAMS 



69 



species formerly known on this coast as Lucina bore- 

 alis^ and sometimes as Lucina filosa^ Stimp., which, 

 however, is an Atlantic species. It has also been 

 called Lucina acutilineata^ Conr. The shell is large 

 and full, and its outside is marked with sharp, con- 

 centric ridges. 



Fhacoides tenuisculptus, Cpr., the Fine-lined Lu- 

 cine, occurs mostly in the cold waters of the north, 

 ranging from Puget Sound to Bering Sea, though 

 it occasionally occurs as far south as Catalina Island. 

 Alaska dredgings from muddy bottoms yield it 

 abundantly. The shell is chalky and it is usually 

 somewhat abraided. 



Fig. 45, X I (*) 



Still another illustration of a member of this 

 genus is given in Figure 45, which shows both the 

 inside and outside of Fhacoides richthofeni^ Gabb, 

 the Heavy Lucine. It is occasionally found at Cata- 

 lina Island, Long Beach, and southward, though it 

 is never plentiful. It is a small, heavy shell, the 

 picture being drawn from a young specimen, very 

 clearly marked. 



