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.] 



Texas. 



Diplocaulidas 



Eryopidas 



Eryops 



Trimerorachidae . . . 



Zatrachida; 



Dissorophidae 



Aspidosauridas . . . . 



Aspidosaurus . 

 Trematopsidae . . . . 



Ly sorophidae 



Gymnarthridae. . . . 

 Cricotidas 



Cricotus 



New Mexico. 

 Eryops (?). 



I Texas. 



Diadectidae 



Diadectes. . . 



Aspidosaurus (?). 



Clienoprosopus. 



Bolbodon . . . . 



Chilonyx 



Diadectoides . 



Bolosauridae 



Pariotichida2 



Captorhinidac 



Captorhinus . 



Labidosaurida; 



Labidosaurus .... 



Seymourida; 



Pantylidas 



Poliosaurida2 



Poliosaurus 



Varanosaurus. . . . 



Poecilospondylus . 



Theropleura 



Caseidas 



Areoscelidae 



Clepsydropidae 



Clepsydrops . . . . 



Dimetrodon . . . , 

 Edaphosauridae 



Edaphosaurus . 



New Mexico. 



Diadectes (Nothodon). 

 Diasparactus. 

 Animasaurus. 

 LimnosceHs." 



Several small unde- 

 scribed bones (?). 



LimnosceHs. 



Ophiacodon. 

 Elcabrosaurus. 

 Arribasaurus. 

 Scoliomus. 



Clepsydrops (?). 



Edaphosaurus (?). 

 Platyhistrix. 



• Limnoscelis may be nearer to Labidosaurus. 



