128 THE WASATCH AND BRIDGEE FAUNiE. 



Anostira kaduuna Cope. 



Proceediogs Amcricau Fbiloeophical Society, 1872, p. 555 (published October 12). 

 Plato XVII, figs. 18-19. 



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 Anostire 

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

 the anterior marginal costal bone, of closely packed vermicular ridges which 

 run out flat on the posterior and upper edge. In the posterior, it consists of 

 only closely placed minute tubercles over the whole surface, which are 

 more or less confluent on the proximal part of the bone. 



Measurements. 



M. 



Length of front marginal on free edge 025 



Width of front marginal on free edge OiS 



Length of posterior marginal on free edge 025 



Width of posterior marginal on free edge 025 



The specimen on which this species reposes cannot well be regarded 

 as an overgrown A. ornata, since the sculpture of the bones is not enlarged 

 in proportion to the size of the elements of the skeleton. The tubercles 

 and ridges are not larger than those on a small A. ornata. 



One specimen from the Bridger bad lands of Hams Fork, Wyoming. 



Anostira ornata Leidy. 



Proceed. Acad. Phila., 1871, p. 102. Report U. S. Geol. Surv. Terrs., 1872 (1873), p. 174. Plate ivi, 



figs. 1-6. 



This species has been so fully described by Leidy, that I only give a 

 brief synopsis of its characters. 



The outline is a broad oval with an open emargination in front. The 

 median dorsal line is keeled posteriorly, as far as the posterior border. The 

 posterior marginal bones are thickened so as to have in part a triangular 

 section. The margin is acute and not or but little recurved. The sculpture 

 of the costal bones is in obsolete ridges running parallel with the middle 

 line, and close together. That of the marginals is in small tubercles which 

 run together at the proximal part of the bone above, and generally on the 

 inferior surface. 



The branches of the plastron are all narrow, and the transverse ones 



