NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 



149 



and in any attempt to picture the natural habitat this must be reckoned 

 with. The deposits in which the skeletons are found are not the same in 

 form and composition as those among which the animals lived. The material 

 has been transported at least as far as the skeletons and has suffered much 

 alteration. 



Table 3. — Showing forms in New Mexico and Texas which exhibit parallelism or relationship in structure 



and habits. 



[Forms marked with a question mark (?) may later be recognized as distinct genera, but as yet there is 



insufficient evidence.] 



New Mexico. Texas. New Mexico. 



Texas. 



Diplocaulidee 



Eryopidae 



Eryops 



TrimerorachidsB. . . 



ZatrachidsB 



Dissorophidas 



Aspidosauridae . . . . 



Aspidosaurus . 

 Trematopsidae. . . . 



Lysorophidae 



Gymnarthridse. . . . 

 Cricotidffi 



Cricotus 



Eryops (?). 



Aspidosaurus (?). 



Chenoprosopus. 



Texas. 



Diadectidas 



Diadectes. . , 



Bolbodon 



Chilonyx 



Diadectoides . . 



Bolosauridae 



Pariotichidje 



Captorhinidas 



Captorhinus 



Labidosauridas 



Labidosaurus. . . . 



Seymouridas 



Pantylidas 



Poliosauridae 



Poliosaurus 



Varanosaurus. . . . 



Pcecilospondylus . 



Theropleura 



Caseidae 



Areoscelidffi 



Clepsydropidse 



Clepsydrops 



Dimetrodon 



Edaphosauridas 



Edaphosaurus . . . 



Diadectes (Notliodon). 

 Diasparactus. 

 Animasaurus. 

 Limnoscelis." 



Several small unde- 

 scribed bones (?). 



Limnoscelis. 



Ophiacodon. 

 Elcabrosaurus. 

 Arribasaurus. 

 Scoliomus. 



Clepsydrops (?). 



Edaphosaurus (?). 

 Platyhistrix. 



' Limnoscelis may be nearer to Labidosaurus. 



