470 AXEL A. OLSSON 



This is a widely distributed species in the West Indian-Caribbean region; 

 the Pacific shell appears to be equivalent but is much less common. It has 

 been recorded from the Pleistocene of California and is also known to occur 

 in the Pleistocene of the Burica Peninsula, Panama. 



Range — California to Panama. Also throughout the Caribbean and 

 West Indian region northward to Massachusetts. Panama Canal Zone: 

 Far Fan Beach. 



