JUL 7 ^922 



BUI,I,BTINS 



OF 



AMERICAN PAI,BONTOI.OGY 

 Vol. 9 



No. 39 



The fiHlocene of Northern Costa Rica 



With Notes On Its General Stratigraphic Relations 



BY 



A. A. OLSSON 



Part 2 



CLASS PELECYPODA 



{Pp. 1 6g- Finis) 



J line 21, ig22 



Harris Co. 

 Cornell University, Ithaca, N. Y, 



U. S. A. 



