30 



WEST COAST SHELLS 



making a deep pit be- 

 hind the hinge. The 

 name is Limopsis va- 

 ginata, Dall, and we 

 will call it the Beard- 

 ed Ark-shell. 



A remarkable new 

 shell was obtained a 

 few years ago by some 

 fishermen who were 

 pursuing their calling 



Fig. 13. X t (*) 



on the waters of San 

 Pedro Bay. From a 

 depth of 25 fathoms 

 they hauled up a liv- 

 ing specimen of a 

 large shell, such as 

 had not been seen 

 there before, or at 

 least had never been 

 described. It was sent 

 by two enthusiastic 

 conchologists to Washington, where it was named by 

 Dr. Dall Atrina oldroydii, Oldroyd's Pinna. There 

 are two large, dark valves, some nine inches long, 

 broad above and pointed at one end. Externally it 

 is almost black, but the inside is a dark olive-gray, 

 with some iridescence. It is the first Pinna ever 

 found in this part of the ocean, though in some 

 other parts of the world these large, thin "feather- 

 shells" are common enough. One or two other speci- 



Fig. 14. X ^ (*) 



