6 PERMO-CARBONIFEROUS VERTEBRATES FROM NEW MEXICO. 



and Upper Permian age. Below these and conformable with them, in New Mexico 

 and probably elsewhere, are not less than 300 feet, probably more, of prevailing 

 coarser and darker-colored, often brownish sandstones, and dark-colored clay 

 beds, yielding vertebrate remains hitherto considered to be of Permian age, but 

 which in all probability are in part at least of upper Pennsylvanian age. 



List of Known Vertebrates from the Permo-Carboniferous Beds of New Mexico. 



Pisces. Shark, like Pleuracanthus. 

 Amphibia. 



Eryops (?) reticulatus. Cope, Am. Nat., vol. xv, p. 1020; Case, Pub. 146, Carnegie 

 Institution of Washington, p. 30. 



* Eryops (?) grandis Marsh. (Ophiacodon grandis) Marsh, Am. Jnl. Sc.,_vol. xv, p. 



211. Williston {Eryops grandis) , Axnencaxi Permian Vertebrates, Chicago, 19 11, 



p. 10. 

 Aspidosaurus novomexicanus Williston. American Permian Vertebrates, Chicago, 



1911, p. 12. 

 Platyhystrix rugosus Case. Case {Ctenosaurus rugosus), Bull. Am. Mus. Nat. Hist., 



vol. xxviii, p. 176. Williston {Platyhystrix rugosus), American Permian Verte- 

 brates, Chicago, 1911, p. 135. 

 Chenoprosopus milleri Mehl. 

 Genus indet., a small unidentified hiunerus. 

 Reptilia. 



Diadectes {Nothodonfj lentus Marsh. Marsh {Nothodon), Am. Jnl. Sc, vol. xv, p. 410. 



Case {Nothodon), Publication No. 145, Cam. Inst. Washington, p. 30. Williston 



{Nothodon), American Permian Vertebrates, Chicago, p. 16. Case and Williston 



{Diadectes lentus), Am. Jnl. Sc, vol. xxxiii, p. 339. 

 Animasaurus carinatus Case and Williston. Am. Jnl. Sc, vol. xxxiii, p. 339. 

 Diasparactus zenos Case. Bull. Am. Mus. Nat. Hist., vol. xxviii, p. 174. 

 Elcobresaurus baldwini Case. Publication No. 55, Carn. Inst. Washington, pp. 28 



and 89. 

 Arribasaurus navajovicus Case. {Dimetrodon navajovicus) Publication No. 55, Cam. 



Inst. Washington, pp. 56 and 137. 

 Ophiacodon mirus Marsh. Am. Jnl. Sc, vol. xv, p. 411. Baur and Case, Trans. Am. 



Phil. Soc, vol. XX, p. 5. Williston, American Permian Vertebrates, Chicago, 1911, 



p. 81. 

 Sphenacodon ferox Marsh. Am. Jnl. Sc, vol. xv, p. 410. Baur and Case, Trans. Am. 



Phil. Soc, vol. XX, p. 4. Case, Publication No. 55, Cam. Inst. Washington, 



p. 66. Williston, American Permian Vertebrates, Chicago, 1911, p. 78. 

 Edaphosaurus novomexicanus Williston and Case, sp. nov. 

 Scoliomus puercensis Williston and Case, gen. et sp. nov. 

 Limnoscelis paludis Williston. Am. Jnl. Sc, vol. xxxi, p. 378. Idem, vol. xxxiv, 



p. 457. American Permian Vertebrates, Chicago, 1911, p. 23. 



The genera Dimetrodon and Clepsydrops previously determined from the New 

 Mexican locality have not been confirmed by later work. 



* The reference of these two species to Eryops is in a measure provisional, as later studies indicate a 

 closely allied but distinct genus. 



t The characters of Nothodon, so far as they have been determined, are identical with those of Dia- 

 dectes, but there is a very considerable possibiUty that the skeletal characters other than those of the skull, 

 the only part known, may justify the original generic name. 



