

DESCRIPTIONS OF NEW EXTINCT REPTILES FROM THE 

 UPPER GREEN RIVER EOCENE BASIN, WYOMING. 



By E. D. Cope. 



Grocodilus (Ichthyosttchus) sublai us. Cope, sp. nov. 



Some of the cervical vertebrae without hypapophyses. Their cups 

 round. Dentition peculiar. One or two very long smooth compressed 

 straight teeth in the front of the ramus mandibuli. These are followed 

 abruptly by a closely set series of sub-equal teeth of not one-fourth the 

 size, varying little to the back of the jaw. The long teeth have sub- 

 compressed crowns with opposed cutting edges, and are smooth except 

 at their bases. These are distantly sulcate, the separating ridges being 

 acute. The smaller teeth are perfect cones and resemble those of Gars 

 without their sulci. 



There are more long teeth in the premaxillary bone than below. Pit- 

 ting of the cranium distinct, elegant. Length of skull about one foot. 

 Length of long teeth 1.25 inches ; of small ones .5 inch. 



Crocodilus sulcifertjs. Cope, sp. nov. 



A medium sized species with cranium deeply and roughly pitted. The 

 chief character is at present visible in the teeth. The larger of these 

 are of sub-cylindric and short conic crown, which is superficially grooved 

 from basis near apex ; sulci coarse, open. 



Anostira radtjlina. Sp. nov. 



Based on two marginal bones one from the front, the other from the 

 rear, of the carapace of an animal of twice the bulk of the largest Anostere 

 yet found. Apart from size, the sculpture is peculiar. It consists in the 

 anterior of closely packed vermicular ridges which run out fiat on the 

 posterior and upper edge. In the posterior, it consists of only closely 

 placed minute tubercles over the whole surface. 



M. 



Length front one on free edge 0.025 



Width " " " .028 



Length posterior on free edge 025 



Width " " " , 025 



October 12th, 1872. 



