146 



MEMOIRS OF THE CARNEGIE MUSEUM 



the plastral scutes is not greatly different from that of other Testudinidse. The 

 gulars have a length on the midline of 90 mm.; pectorals of 60 mm.; abdominals of 

 255 mm.; femorals of 95 mm.; anals of 86 mm. The principal dimensions and 

 proportions of specimen C. M. No. 3403, as compared with other specimens iden- 

 tified as pertaining to Hadrianus corsoni Leidy, are given in the table below. 



C. M. No. 3403. 



Greatest length of plastron 



Greatest length anterior lobe 



Greatest width anterior lobe 



Width of bridge 



Greatest length posterior lobe 



Greatest width posterior lobe 



Length of entoplastron 



Width of entoplastron 



Width of lip 



Width of bridge to width of anterior lobe . . 



Width of anterior lobe to its length 



Width of bridge to length of posterior lobe 



778 

 252 

 .345 

 290 

 234 

 386 

 155 

 184 

 162 

 81% 

 72% 

 80% 



HuiManua cot- 

 soni A. M.N. H. 



No. 6027. 



550 

 175 

 246 

 215 

 157 

 240 

 115 

 134 

 118 

 87% 

 71% 

 73% 



Type of H. octo- 



narhis U. S. 

 N.M.No. 2186. 



740 

 247 

 360 

 285 

 240 

 330 

 125 

 160 

 135 

 79% 

 68% 

 84% 



14. Hadrianus robustus sp. no v. 

 Plate XXV, fig. 2; text-fig. 19. 



Type : C. M. No. 3342, consisting of the anterior half of the plastron, collected 

 by Earl Douglass, July 30, 1908. 



Locality: Near Kennedy's Hole, Uinta Basin, Uinta County, Utah. 



Horizon: Horizon C, Uinta formation. Upper Eocene. 



The specimen upon which the present species is based represents one of the 

 larger species of the genus. Those parts present are in a good state of preservation, 

 and all of the sutures and sulci can be clearly traced. It is assigned provisionally 

 to the genus Hadrianus, until such time as the discovery of a more perfect specimen 

 makes it possible to determine its true generic affinities. 



The anterior lobe is 220 mm. long, and at the base 285 mm. wide. The length 

 thus being 77 per cent, of the width, whereas in Hadrianus corsoni it is only 71 and 

 in H. niajusculus 68 per cent. The lip in this species is especially prominent and 

 exceedingly heavy, having a thickness at the center of 46 mm. At the base it 

 measures 123 mm. in width, and near the anterior end 117 mm. From the point 

 where the gular-humeral sulcus crosses the free border the lip extends forward 52 

 mm. The anterior border of the lip is transversely broadly convex, and bluntly 

 bevelled dorso-ventrally, the longer bevel being on the lower side. On the superior 

 surface the lip extends posteriorly 100 mm., at this point the surface descends 

 perpendicularly, decreasing by one-half the total thickness of the plastron. Slightly 



