766 THE WHITE EIVER FAUNA. 



deep notch into two rounded lobes, whose border is notched three times, 

 leaving four teeth of smaller size than those of the lip. 



The lateral suture of the nuchal marginal bone is much less oblique 

 than in T. amphithorax and other species. The entosternal bone has eight 

 sides. It is as wide as long, and narrows forwai-ds. The dermal sutures are 

 grooves with raised edges. This character is quite marked, and cannot be 

 looked upon as indicating immaturity, as the animal is evidently adult. 

 The nuchal scute is as wide as long, offering a strong contrast to that of 

 T. ligonius, where it is long and narrow. Its lateral sutures terminate in 

 mucros, which leave a concave margin between them. Vertebral scuta a 

 little longer than wide. The anal scutum has a straight superior border, 

 and is twice as wide as long. The gular scuta have a very oblique poste- 

 rior border, and each one is about as long as the external free edge of the 

 lip. The humero-pectoral suture retreats abruptly backwards from the 

 free humeral border before becoming transverse. At its middle it is as far 

 anterior to the pectoro-abdominal suture as the latter is from the abdomino- 

 anal, thus leaving a much wider pectoral scutum than is found in T. ligonius 



and T. amphithorax. 



Measurements. 



M. 



Length of carapace (axi.iU ^^^ 



Width of carapace (axial) 35t) 



Length of plastron (greatest) 438 



Width of base of anterior lobe ~00 



Width of base of lip 085 



Length of lip on external edge 045 



Greatest length of posterior lobe (axial) m 



Width of posterior lobe at base - 200 



Width of anal marginal above 070 



Width of anal marginal on margin 037 



Length of nuchal scute 027 



Length of second vertebral scute 032 



Width of second vertebral scute 080 



From the head of Horse Tail Creek, Colorado. 

 Testudo ligonius Cope. 



Paleontological Bulletin No. 15, p. 6, August 20, 1«73. Annual Report U. S. Geo!. Surv. Terrs., 1873 



(1874), p. .511. 

 Plate LXI; figs. 2,3. 



Parts of carapace and plastron of one specimen represent this species 

 in my collection. In the locality where I found this and most of the other 

 specimens of tortoises from the White River beds here described, specimens 



