M 



Width crown of second molar 0045 



" between two " " 014 



" ". " canines 005 



From near Black's Fork of Green River. 



I would refer to Notharctus, my LopMotherium vasachiense, adding the 

 fifth species to the genus. These are JV. gracilis, Marsh. jV. tyrannus, 

 Marsh, N. tenebrosus, Leidy, JV. robustior, Leidy, and N. vasachiensis, 

 Cope. 



Hadrianus allabiattjs. Cope. 



This large land tortoise is nearer in general form to the H. quadratus 

 than to the H octonarius, but differs from both in the absence of the pro- 

 jecting lip of the anterior lobe of the plastron, which is thus simply 

 truncate. The mesosternum is not cordate, but has much the shape of 

 that of H. quadratus, that is, rhombic. The scutal sutures are deeply im- 

 pressed. The plastron is strongly concave. Carapace without irregu- 

 larities of the surface. Length eighteen inches. 



From the Bad Lands of Cottonwood Creek, Wyoming. 



Emys latilabiatus. Cope. 



Represented by a perfect specimen of a tortoise of a broadly oval form, 

 and somewhat terrestrial habit. Its prominent characters are to be seen 

 in the plastron, of which the posterior lobe is deeply bifurcate. The an- 

 terior lobe is peculiar in the unusual width of the lip-like projection of 

 the clavicular ("episternal") bone, which is twice as wide as in E. cyo- 

 mingensis, and not prominent. Bones all smooth ; margins of lobes of 

 plastron thickened. Length of shell, one foot. 



M. 



Width of lip of plastron 06 



Depth of posterior notch 02 



From near Black's Fork of Green River. 



Protagras lacustris. Cope. 



Gen. et sp. nov. 



A serpent of about the size of the existing "Pine Snake " (Pityophis 

 melanolencus), and allied to the water snakes of Tropidonotus and allied 

 genera. 



A vertebra before me has the longitudinal hypapophysial groove of that 

 group, which terminates in a very obtuse point. The ball looks exten- 

 sively upwards. The upper articular extremity of the parapophysis is 

 short and obtuse, and the inferior equally so, and directed shortly down- 

 wards. The articular face being continuous with each other. It sends 

 an obtuse keel backwards, which terminates in front of the ball. The 

 angle connecting the diapophysis and zygapophysis is strong, while 

 the former was narrow ; in the specimens it is broken. 



