GEOLOGICAL SURVEY OF THE TERRITORIES. 587 



a Larger species : 

 Astragalus everted in front; nearly as wide as long; 



lower premolars narrower, more elevated, and rugose. .B. radians. 

 Lower premolar broad, lower, and smooth B. semicinctus. 



aa Smaller species : 

 Astragalus much wider than long, decurved in front B. latipes. 



Bathmodon radians. Cope. 



ProceediDgs Americau Philosophical Society, 1872, (February IG,) p. 418. Hayden'a 

 Geological Survey of Montana, 1871, p. 350. 



In addition to the characters already assigned to these species as above 

 cited, I add the following : 



The apex of the scaimla is a massive flattened acumination with trun- 

 cate extremity. The spine is elevated and truncate next the glenoid 

 cavity, which is a wide oval, much iDroduced -at the coracoid margin. 

 The transverse process of the atlas is rounded distally, and is about as 

 long as wide ; the surface for the axis is directed obliquely inward. The 

 Jibula has the inner sharp edge prolonged to the proximal end ; the form 

 of the latter is much as in Eohasileus. The astragalus is slightly concave 

 in both directions on thetrochlear face, mostsoautero-posteriorly. The 

 anterior outline of the same is strongly and obliquely convex, and the 

 surface is produced sideways into a latero-anterior apex. The inner 

 malleolar border is thus very concave ; the outer is gently convex with 

 a long fibular facet. The posterior margin concave, the inner tuberosity 

 prominent. The navicular facet is as broad as long, and nearly sessile, 

 being probably separated bva groove from the tibial. The cuboid facet 

 is subround, smallj and sublateral ; the calcaneal situated diagonally 

 opposite each other. The antero-internal is twice as large as the other, 

 is transverse and truncate internally by a facet near the aj)ex, at right 

 angles. The other calcaneal facet is subround. 



Measurements. 



M. 



Length ramus mandibuli to anterior margin of coronoid process - 0. 310 



Length premolars and molars 218 



Length last molar crown 040 



Width last molar crown 030 



Width last premolar crown 018 



Length last premolar 025 



Width symphysis at canines U45 



Diameter canines $ 028 



Diameter canines 9 023 



Length exposed portion incisor 2 026 



Width crown incisor 2 0245 



Length diapophysis atlas 047 



Width diapophysis atlas 056 



Width facet for axis 053 



Width glenoid cavity scapula, (straight) 086 



Length coracoid from inner basis 045 



Length proximal articulation fibula 027 



Length distal articulation fibula 042 



Diameter shaft fibula 042 



Total length astragalus, (fore and aft) , 072 



Total width astragalus 065 



Length navicular facet 045 



Width navicular facet 034 



Width cuboid facet 025 



Length cuboid facet 023 



Length anterior calcaneal facet 040 



Width anterior calcaneal . . do 024 



Length posterior calcaneal ..do 021 



Length fibular, . ....do.. '.(axial) 043 



