1892.1 1^^ [Cope. 



small as those of the first and second rows, and extend posteriorly to the 

 anterior part of the fourth of the fourth row, and not beyond. The crowns 

 of the teeth are perfectly smooth and without keel or depression. 



MM. 



Length of tooth series 17 



Six teeth of external row 10 



Six teeth of third row 11.5 



Six teeth of fourth row 1G.5 



^. , (anteroposterior 3 



Diameters of fifth of fourth row < . „ 



I transverse 7 



The horizon of this species is not exactly known, but it is probably 



Lower Cretaceous. It gives me much pleasure to dedicate it to Dr. E. T. 



Dumble, Director of the Geological Survey of Texas. 



IV. TuiAssic on BoKUM Beds. 



The fossils from these beds present a general similarity to those obtained 

 elsewhere in the Trias. Fragments of large Stcgocephali are abundant, 

 and Crocodiliaus of the Parasuchian group are still more so. Teeth like 

 those of the Eastern Clepsysaurus and Zatomus also occur. The number 

 of identifiable species is small, and the best preserved of these is a new 

 representative of the genus Episcoposaurus Cope, already desciMbed from 

 theTriassic bed of New Mexico.* 



Episcoposaurus haplocerus sp. nov. 



I refer to this species the following pieces which were found together by 

 Mr. W. T. Cummins. A dorsal and probably two caudal vertebme ; a 

 scapula of the right side ; a few fragments of ribs, and about thirty 

 dermal bones. The generic characters and those of higher value may^be 

 first described. 



The single dorsal vertebra is from the posterior part of the series. Its 

 articular surfaces are shallowly concave. The neural arch is not entirely 

 coossified, part of the sutural surface being visible in the fracture, from 

 which the neurapophysis has been broken. There is a rib-facet at each 

 end. The smaller, which is longer than deep, is continuous at an open 

 angle with the tubercular articulation of the short diapophysis. The other 

 is longer than deep, lenticular in outline, and terminates acutely above. 

 The scapula is massive, and the inferior extremity is thinned below and 

 turned obliquely inwards. No proscapula. The coracoid facet is not 

 large, and is separated by an angle from the glenoid cavity. The ribsare^ 

 flat, not very wide, and have one subacute edge. The head of one is 

 attached to the dorsal vertebra, above described. The capitular and 

 articular surfaces are subequal and are separated by an angle. The dermal 

 bones are thick and are united by suture, so as to form transverse bands 

 across the body; but are not united in the anteroposterior direction. Some 



* Proceedings Amer. Philos. See, 18S7, p. 213. 



PROC. AMER. PHILOS. SOC. XXX. 137. Q. PRINTED APRIL, 3, 1893. 



