4 AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



Pisces — continued. 

 Selachii: 



Janassa giirleiana, J. strigilina, J. ordiana. 

 Diplodus (?) compressus, D. sp. 

 Orthacanthus gracilis, 0. quadriseriatus. 

 Batrachia: 

 Stegocephali: 

 Ganocephala: 



Eryops megacephalus, Trimerorhachis insignis, Zatrachys serratus, 

 Parioxys ferricolus, Pantylus cordatus. 

 Embolomera: 



Cricotus heteroditus, C. gibsoni. 



Lysorophus tricarinalus was listed in the family Clepsydropidcs, and Dip- 

 locaulus in a new family Diplocaulida, both under the Pelycosauria. 



In the "American Naturalist" for December of i88l (29), Cope described 

 from the Permian deposits of New Mexico Eryops reticulatus and Zatrachys 

 apicalis. 



In the "American Naturalist," 1882, page 335 (30), Cope corrects the 

 previous reference of Eryops, Trimerorhachis, and Rhachitomvs to the Gano- 

 cephala. They were placed in that order because Cope believed Archegosaurus 

 to have rhachitomus vertebrae, but as it was shown by Fritsch that Archego- 

 saurus has discoidal vertebrae, the old group must be abandoned and a new 

 substituted. He proposed a new suborder, Rhachitomi, which he divided 

 into two families: 



Occipital condyle concave, undivided Trimerorhachida 



Occipital condyle divided into two lateral condyles Eryopides 



The first family included Trimerorhachis only, the second, ? Parioxys, 

 Eryops, Actinodon, Zatrachys, ? Pantylus. 



In a more extended article in the "Proceedings of the American Philo- 

 sophical Society," a little later in the same year (31), he described as new 

 Acheloma cumminsi and Amsodexis imbricarius, which he placed in the order 

 Rhachitomi: family Eryopides. He listed as members of this family: 



Anisodexis imbricarius. Eryops megacephalus. 



Acheloma cumminsi. Actinodon trossardi. 



Eryops reticulatus. Zatrachys serratus. 



Eryops ferricolus {Parioxys olim). Zatrachys apicalis. 



The occipital condyles of Acheloma and Zatrachys were unknown to him 

 and so the genera were included provisionally. In a note to this paper it is 

 stated that Peplorhina arctata is not a fish, but a Theromorph Saurian (Pely- 

 cosaur). See a later note by Case (11). 



The genus Diplocaulus was recognized as an amphibian and placed in the 

 suborder Microsauna. 



In 1883, in the fourth contribution to the history of the Permian forma- 

 tion of Texas (32), Cope described Trimerorhachis bilobatus and the fishes 

 Ectosteorhachis ciceronius and Gnathorhiza serrata. 



