1882.] 4bl [Cope. 



the Permian of the Uuited States.* It is not improbable that such occur- 

 rence of genera may yet be substantiated, but the identification of an or- 

 der hitherto unknown in a formation, on uncertain characters, is not a safe 

 proceeding. The vertebrae of Leptophractus although not certainly known, 

 are supposed to be of the Labyrinthodont type. The teeth are much more 

 compressed and trenchant than in the present species, nor do there appear 

 to be any long ones near the symphysis mandibuli. I consider the ques- 

 tion of reference to Leptophractus to be still an open one. 



The family EryopidcB, though abundant in individuals, is not represented 

 by many species. They are presumably as follows : 



Anisodexis imbricarius Cope. 



Acheloma cumminsi Cope. 



Eryops reticulatus Cope. 



Eryops ferricolm Cope (Parioxys oUm). 



Eryops megacephalus Cope. 



Actinodon frossardi Gaudry . 



Zatrachya serratus Cope. 



Zatrobchys apiealis Cope. 



But the occipital condyles are unknown in Acheloma and Zatrachys. 



I may add here that through the courtesy of Messrs. Scott and Osborne, 

 I have seen, in the Museum of Princeton College, vertebrae of some species 

 of the I^hachitomi from Saarbriicken, along with Archegosaurus, with entire 

 centra, from the same locality. 



Synopsis of the Vertehrata of the Puerco Eocene epoch. By E. D. Gope. 

 {Bead before the American Philosophical Society, October 20, 1882.) 

 REPTILIA. 

 CROCODILIA. 

 Crocodilus sp. 

 Crocodilus sp. 

 Crocodilus sp. 



TESTUDINATA. 



Plastomenus ? communis Cope. 

 Dermatemys sp. 

 Compsemys sp. 

 Emys sp. 



* Peplorhina arcta^a Cope, from the Illinois Permian, is not a Peplorhina, but 

 a Theromorpli Saurian. 



