58 WEST AMERICAN SHELLS 
ever is an Atlantic species. Also, L. acutilineata, 
Conr. (Arnold). The outside of the shell is marked 
by sharp concentric ridges. 
Phacoides tenwsculptus, Cpr., 
the Fine-fined Phacoides, is shown 
in Figure 44. It occurs mostly in 
the cold waters of the north, rang- 
ing from Puget Sound to Bering 
Sea, though it occasionally oc- 
eurs as far south as Catalina 
Island. Alaskan dredgings from muddy bottoms 
yield it abundantly. Shell chalky, usually some- 
what abraded. 
Still another illustration of a member of this 
genus is given in Figure 45, which shows both the 
inside and outside of Phacoides richthofeni, Gabb, 
Fig. 45, x 2 (*) 
the Heavy Lentil-shell. It is found at Catalina 
Island, Long Beach, and southward, never plenti- 
fully. It is a small, heavy shell, the picture being 
made from a young specimen, cleanly marked. 
