504 



NORTH AMERICAN INDEX FOSSILS. 



Throughout California. 

 386. P. (Chlamys) fucanus Dall. (Fig. 675, a, b.) Miocenic. 



Surface reticulate. Right valve marked with more or less une- 

 qual, squarish, radially striate ribs, with at times smaller riblets 



Fig. 675. a, b, Pecten {Chlamys) fucanus; c, d, P. (Patinopecten) healeyi ; e, 

 Pecten steamsii. All X %> (After Arnold.) 



between. Left valve with radially striate ribs, the median one 

 stronger than the rest and usually with imbricating scales. 

 Washington, Alaska. 



387. P. (Chlamys [Patinopecten] ) healeyi Arnold. (Fig. 

 675, c, d.) Pliocenic. 



