SEP 24 1902 ^U 



April 5, 1878.1 ^UO [Cope. 



Descriptions of Extinct Batrachia and Reptilia from the Permian forma- 

 tion of Texas. 



By E. D. Cope. 



{Read before the American Philosophical Society , Aprils, 1878.) 



Reptilia. 

 Diadkctes sideropelicus. Gen. et. sp. nov. 



Char. Gen. Teeth with short and much compressed crowns, whose long 

 axis is transverse to that of the jaws. Edges of the crowns obtuse, with 

 tuberosities on some of them, distinct from the principal apex. The latter 

 is worn off very obliquely by attrition in all of the specimens. The 

 crowns covered with an enamel-like substance which lias no especial sculp- 

 ture. Alveoli not separated. The external alveolar border in each jaw is 

 more elevated than the internal, and in the superior series at least, diverges 

 from the tooth-line backwards and outwards. The surface of attrition de- 

 scends outwards in the maxillary series, and rises inwards in the dentary 

 series. A large fossa pierces the inner alveolar border just behind the 

 inner extremity of each tooth. 



The affinities of this very singular form cannot yet be determined. The 

 mandibular ramus rises directly from the posterior extremity of the dental 

 series, showing that there is a coronoid elevation of the dentary bone as in 

 Dinosauria. The teeth are received into deep alveoli. It is probable that 

 the vertebrae are amphiccelous. The animals belonging to this genus were, 

 in all probability, herbivorous. 



Ghar. Specif. The jaws, and probably other bones of three individuals 



of this species, represent it in my collection. The lateral tuberosity of the 



teeth already described is on the most elevated, hence opposite, borders 



of the crowns in the two jaws. It differs in its degree of prominence in 



different teeth, but is .subject to attrition in one of the jaws at least. The 



form of the principal worn surface is an elongate oval. The investing 



layer of the crown is perfectly smooth, excepting between the lesser and 



greater cusps, where the obtuse edge is slightly longitudinally grooved. 



The surface of the jaws is not sculptured. 



Measurements. M. 



Greatest elevation of a tooth (No. 1) Oil 



_. . ( transverse (TOOl? A- — 



Diameters of crown \ . ^T7T\ (As, 



I antero-postenor j^l^x 



Four teeth occupy 042 



Four alveoli of No. 2, occupy 024 



The jaws are as large as those of a medium-sized alligator. 



DlADECTES LATIBUCCATUS. Sp. nOV. 



The anterior portion of a probably maxillary bone represents this spe- 

 cies. On comparison with the corresponding portion of the jaw of D. side- 



PROC. AMER. PHILOS. SOC. XVII. 101. 3k. 



