630 GEOLOGICAL SURVEY OF THE TEERITOEIES. 



sosternal bone truncates the clavicular extensively, giving it thus a more 

 elongate form. The gular scuta expands to its front margin. The mar- 

 ginal bone is stout and sharp-edged, and is not so deeply impressed by 

 the dermal suture as in P. polycypha. 



Emys polycyphus, Cope. 



Falwotheea polycypha, Coidc. Proceed. Amer. Philos. Soc, 1872, p. 463. 



This species of tortoise is indicated by vertebral, costal, and marginal 

 bones of very small individuals. These bones are, however, not only 

 thoroughly ossified, but are very stout, indicating the adult age of the 

 animal. The deeply-impressed scutal sutures, and heavy proportions, 

 as well as the elevated carina of the carapace, indicate affinity with 

 Gisticdo, or, perhaps, Testiido. As another generic character, it may be 

 noted that the vertebral bones are subquadrate and supjjort the neural 

 canal without intervening lamina. 



The carina of the carapace is abruptly interrupted occasionally ; some- 

 times with, sometimes without, a pair of pits, one on each side. The 

 marginal bones are well recurved, and the scutal sutures are deeply im- 

 pressed on them. 



Measurements. 



■ _ M. 



Length of vertebral bone 009 



Width of vertebral boue 0085 



Length of marginal bone 01 



This is the least of the tortoises of the Bridger formation. 



HADRIAIS^US, Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 468. 

 This genus resembles Testiido in form, but has two anal scuta, as in 

 most Urn ydidce. The claws are short and stout: an ungual phalange is a 

 long oval viewed from above, and is oval in section, with obtuse edges. 

 The articular surface is subiuferior. A cervical vertebra is of moderate 

 length, and has a very ijrominent anterior zygapophysis. The centrum 

 presents two distinct convex articular surfaces anteriorly, and one trans- 

 verse one behind. A sacral is free from the carapace above; it presents 

 two subround articular cups posteriorly and outwardly ; the anterior 

 are broken off. These characters are observed in a large specimen of 

 H. Corsonii. 



Hadeianus allabiatus, Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 471. 



This large land-tortoise is nearer in general form to the S. corsonii 

 than to the S. 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 mesosteruum is not cordate, but has much the shape of 

 that of S. corsonii, that is, rhombic. The scutal sutures are deeply 

 impressed. The plastron is strongly concave. Carapace without irreg- 

 ularities of the surface. Length 18 inches. 



From the Bad Lands of Cottonwood Creek, Wyoming. 



Hadeianus octonaeius, Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 468. 



The H. octonarius is distinguished from its congener in many ways. 

 It is of elongate form, strongly contracted at the bridges, but expanded 



