122 MEMOIRS OF THE CARNEGIE MUSEUM 



Anostira ornata Cope, Ann. Report U. S. Geol. Surv. Wyoming, etc., 1872 (1873), 



p. 621; Amer. Naturalist, vol. XVI, 1882, p. 989, fig. 7; Vert. Tert. Form. 



West, 1884, p. 128.— DoLLO, Bull. Mus. Roy. Belgique, IV, 1886, p. 93, PI. 



XI, figs. 7, 8. 



A fragmentary specimen. No. 2954, collected by O. A. Peterson August 24, 

 1912, from Horizon C, Uinta formation, on White River near Ouray, Uinta County, 

 Utah, is provisionally identified as pertaining to the above genus and species. 

 This specimen consists of the articulated nuchal, first and second neurals, with 

 portions of the abutting costals of both sides, parts of several disarticulated costals, 

 eleven peripherals, several of which are complete. The plastron is represented 

 by the right hypoplastron lacking a portion of its outer extremity and many frag- 

 mentary parts. 



The specimen has been carefully compared with the figures and descriptions 

 given by Leidy and Hay, and especially with one of Leidy's cotypes No. 4062, 

 now in the U. S. National Museum, and, with the exception of slight differences in 

 size, it agrees closely in nearly all respects. The present specimen is of about the 

 same size as one individual in the American Museum of Natural History described 

 and figured by Hay in his Turtles of North America, but is considerably smaller 

 than the cotype of Leidy mentioned above. 



All of the specimens described by Leidy are supposed to have come from 

 the lower portion of Horizon B in the Bridger as exposed in the neighborhood of 

 old Fort Bridger, Wyoming. The specimen described by Hay in the publication 

 cited is from the third division of Horizon C of the Bridger on Henry's Fork, Wyo- 

 ming. The discovery of the specimen considered here now extends the geological 

 range of this species into the uppermost horizon of the Uinta formation. 



The nuchal has a length of 15 mm., a width on the free border of 23 mm. 

 The free border is subacute and is not so deeply excavated in front as in the specimen 

 figured by Leidy. The thickness of the nuchal at the midline is 5 mm. 



The first neural has a length of 13 mm., and a greatest width of 6 mm. The 

 bone is coffin-shaped with the widest end forward. The second neural is 9 mm. 

 long, and only 4 mm. wide. 



All of the bones of the carapace are delicately sculptured, though those of the 

 anterior part of the shell appear less distinct than in most of the described specimens. 

 The few costals present show the usual low undulating ridges crossing them at 

 right angles to their shorter diameters. This sculpture is most distinct toward 

 their outer ends. The peripherals have their upper and lower surfaces ornamented 

 by the usual sharp ridges and pustular elevations. 



