T7C) Costa Rica Miocene — Olsson 7 



Preliminary RemarKvS 



The fossil collections and field information, on which this 

 monograph is based, resulted from over two years of field work 

 by the writer in Panama and Costa Rica. The writer's thanks 

 are due to the Costa Rica Oil Corporation for permission to pub- 

 lish; and he is most grateful for assistance, and encouragement 

 received in the course of this work from Drs. A. C. Veatch and 

 D. F. MacDonald of the Sinclair Exploration Company, to the 

 Officials of the National Museum of Costa Rica and Professor 

 J. Fidel Tristan of San Jose'. 



The collections were studied in the Paleontogic Laboratory 

 of Cornell University, the facilities of which. Professor G. D. 

 Harris, most generously placed at my disposal. 



Cornell University, 



January, 1922. A. A. Olsson 



