Maury — Porto Rican Tertiary Formation. 215 



In this Ghianica horizon there are quantities of a very 

 large foraminifer which resembles that figured by Dr. 

 Brown from Antigua. 



The Guanica beds would seem to be almost certainly 

 approximately synchronous with the Antigua beds. 



(7) The Juana Diaz shales furnished very few mollus- 

 can shells. The best were two species of Cuspidaria one 

 apparently identical with Cuspidaria islahispaniolce 

 Maury from Bluff 3, Cercado de Mao, Santo Domingo. 

 The other was new. There was also a very small Leda. 

 The evidence at hand is too scanty for any definite strati- 

 graphic conclusion regarding these beds. 



Correlation. 



The stratigraphic relations, as they appear from our 

 present knowledge of the faunal groups studied, are 

 expressed in the accompanying Correlation Table. 



American Museum of Natural History, 

 New York City, 10 July, 1919. 



