6 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



lomeri and Stegocephali have evidently been derived. We may then present 

 the following genealogical table of the class Batrachia: 



Anura 



Gymnophiona 



Trachystomata 



Proteida 



Embolomeri 



Rhachitomi 



Cope placed in the Rhachitomi, the genera Trimerorhachis, Eryops, Ache- 

 loma, Anisodexis, and Zatrachys. In the Embolomeri he put the single genus 

 Cricotus. 



In the latter part of 1884 appeared the " Fifth Contribution to the knowl- 

 edge of the Fauna of the Permian Formation of Texas and the Indian Terri- 

 tory" (38). In this paper Cope named a new species of Dipnoan, Ceratodus 

 favosus, and two species of the genera Cricotus, C. crassidiscus and C. hypan- 

 tricus. With the former he identifies the specimens of C. heteroclitus, named 

 and described in 1880 (25) and 1884 (37). In the first paper figures a and b 

 of plate II, and in the second paper figures a, b, c, and d of plate 5, are 

 regarded as representing the species crassidiscus and figures / and g of the 

 same plate, in the second paper, the species heteroclitus. 



In 1885 came Cope's discussion "On the Evolution of the Vertebrata, 

 Progressive and Retrogressive" (39); in this he repeated the analytical key 

 of the Permian amphibians, but sHghtly changed his ideas of the phylogenetic 

 relations, as is shown in the following diagram: 



Anura 



Embolomeri 



Urodela 



Trachystomata 



