TESTUDINATA. 147 



cross the median suture (which is straight ou the anterior lobe) some dis- 

 tance apart. The humerals are long, and the humero-pectoral scutal suture 

 is convex backwards, its extremities reaching the margin in front of the 

 axillae. The anterior extremity of the anterior sternal lobe has a quadri- 

 lobate outline. 



The surface is smooth except along the lines of intercostal sutures, 

 where short grooves parallel to the general axis alternate with protuberances 

 having the same direction, the whole having somewhat the appearance of 

 sculptured characters. 



Measurements. 



ML 



Length of carapace (axial) (19 inclies).. .500 



Widtli of carapace (axial) (19 inches).. .500 



Length of plastron from groin 295 



Width of base of anterior lobe 1,55 



Width of extremity of anterior lobe (at gulars) 080 



Length of anterior lobe (at gulars) 123 



Width of nnchal scute Oil 



Length of nuchal scute 024 



Length of third marginal 038 



Width of third marginal 015 



Width of eighth marginal , 090 



Length of eighth marginal 063 



This species, when compared with its nearest ally, B. undata, diifers in 

 the greatly wider marginal scuta; in the latter the corresponding ones 

 (6-7-8-9) are much longer than wide, as in most other tortoises. The 

 intermarginal scuta are of more elongate form, and the normal number is 

 five in B. undata instead of four. The sculpture in the longer known 

 species is entirely distinct, consisting of pits and tubercles scattered gener- 

 ally over the surface; while the peculiar sculpture of the suture lines is 

 wanting. B. liebratca is relatively wider. 



Bad lands of Cottonwood Creek, S. W. Wyoming. 



BAiiNA UNDATA Lcidy. 



Annual Report U. S. Geol. Surv. Montana, 1871, p. 369. Cope, Annual Report U. S. Geol. Surv. Terrs., 

 1872, p. 622. Chistemum undatum Leidy, Report U. S. Geol. Surv. 1, p. 169, pi. xiv. 



Plate XIX, figs. 3-5. 



A specimen of this species presents the following characters: The 

 anterior lobe of the plastron is as wide as that of B. hehraica, but little more 



