BUI,I,BTINS 



OF 



AMERICAN PAI^EONTOIvOGY 



Vol. 9 



No. 39 



The Miocene of Northern Costa Rica 



With Notes On Its General Stratigraphic Relations 



BY 



A. A. OLSSON 



Part 2? 



CLASS PELECYPODA 



{Pp. idp-Elnis) 



June 21 , 1^22 



Harris Co. 

 Cornell University, Ithaca, N. K. 

 U. S. A. 



