April 5, 1878.] 505 [Cope. 
Descriptions of Extinet Batrachia and Reptilia from the Permian forma- 
tion of Texas. 
By E. D. Corps. 
(Reud before the American Philosophical Society, April 5, 1878.) 
REPTILIA. 
DIADECTES SIDEROPELICUS. Gen. et. sp. nov. 
Ohar. 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 has 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 vertebre are amphicelous. The animals belonging to this genus were, 
in all probability, herbivorous. 
Char. 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)........ Sree e ONL 
{MANS VEISE deine sevclecsiailetdciile sts alae QUO 
AMPELO=POStELIOMMejaeieleisisisiais sleisiee cet «Ole 
POUNCE OCC MPa. crits cierep-eit-) 1 Se diatetata te staeistte alas OLS 
Four alveoli of No. 2, occupy..... SHB RORACA NEE Si eaciere 024 
The jaws are as large as those of a medium-sized alligator. 
Diameters of crown { 
DIADECTES 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. xvit. 101. 3K. PRINTED MAY 16, 1878. 
