GILMORE: the fossil turtles of the UINTA FORMATION 159 



Creek, in Wyoming, and the specimen here described is the first record of the oc- 

 currence of this species in the Uinta formation. 



A second specimen, C. M. No. 3330, was collected by Earl Douglass in 1908, 

 near the region of Well No. 2, Uinta Basin, Uinta County, Utah. It comes from 

 the Uinta formation (horizon not given) and consists of fragments of costal plates 

 having sculptured surfaces which are identical with those of the specimen discussed 

 above, and is therefore regarded as pertaining to the present species. 



Order SQUAMATA. 



Suborder SAURIA. 



Family ANGUID^. 



Genus Glyptosaurus Auct. 



19. Glyptosaurus sp. indet. 



A specimen, C. M. No. 3405, consisting of the greater part of the parietal with 

 other fragments of the skull and lower jaws, and a few shields, is identified as per- 

 taining to the lizard-like reptile Glyptosaurus. It was collected by 0. A. Peterson, 

 August 24, 1912, on White River near Ouray, Uinta Basin, Utah, from Horizon C, 

 Uinta formation. Upper Eocene. 



The few osseous shields present are evidently from the trunk of the body. 

 These are oblong quadrate, with a smooth, thinned out anterior end, which is over- 

 lapped by the next plate of the series. The lateral borders are roughened for sutural 

 union. The external surface, excepting the smooth area mentioned above, is 

 ornamented with small rounded tubercles closely arranged in more or less con- 

 centric rows. The cranial shields on the parietal are of irregular sizes with their 

 surfaces ornamented much in the same manner as the trunk-shields. 



This specimen may represent an undescribed species, but at the present time, 

 on account of the very unsatisfactory type specimens upon which the nine de- 

 scribed species have been based, it is impossible to make adequate comparisons, 

 so that the specific determination of the present specimen must await the thorough 

 revision of the species of the genus. It is of interest, however, as recording for the 

 first time the occurrence of the genus Glyptosaurus in the Uinta formation, and also 

 from the fact that it occurs intermediate geologically between the oldest known 

 specimens from the Bridger described by Marsh, and the youngest specimen dis- 

 covered and described by Douglass from the Oligocene." 



^ Douglass, Earl, "Some Oligocene Lizards," Annals of the Carnegie Museum, IV, 1908, pp. 278-283. 



