214 Maury — Porto Bican Tertiary Formation. 



The Ponce beds with the Ostrea cahobasensis would 

 naturally tie up with these Haitian beds, but what the 

 exact time relation of the Ponce bed is with those on the 

 northern side of Porto Rico, I do not know. 



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(6) Dr. Pilsbry has compared our Guanica oyster with 

 the type of Ostrea antiguensis Brown from Antigua. Dr. 

 A. P. Brown's type is very badly preserved, but after 

 making a careful comparison, Dr. Pilsbry writes : "I have 

 no doubt of the identity." 



