GEOLOGICAL SURVEY OF THE TERRITORIES. 613 



these arc of subcyliudric and short conic crown, which is superficially 

 grooved from, basis to near apex ; sulci coarse, open. 

 Upper Green Elver. 



Crocodilus GRtNNELLiij Marsh. 



American Jourual Sci. Arts, 1871, June. 

 Cranium from South Bitter Creek. 



Crocodilus liodon, Marsh. 



Loc. cit. 



From various localities. 



DIPLOCYis^ODUS, Pomel. 



Diplocynodus subulatus, Cope. 



Crocodilus (Iclitht/osucluis) SKhulatus, Cope. Proceedings American Philosophical So- 

 ciety, 1872, p. 554, (October 12.) 



Some of the cervical vertebrae without hypopophyses. Their cups 

 round, with smooth bordering surface of the sides of the centrum. 

 The jaws only are preserved from the cranium; the premaxillary is 

 strongly i)itted, but the dentary has remote shallow pits on the outer 

 face and shallow grooves below. Dentition something like that of 

 Diplocynodns ratelUi from France. There are two very long canine-like 

 teeth in the premaxillary bone near its posterior margin, directed some- 

 what backw^ard ; these are preceded after a space by a medium-sized 

 tooth, which after a similar space is preceded by another large tooth. 

 Anterior to this the alveoli are lost. Two very smooth compressed 

 straight teeth in the front of the ramus mandibuli. These are followed 

 abruptly by a distantly set series of subequal teeth of not one-fourth 

 the size, varying little to the back of the jaw; all the long teeth have 

 subcompressed crowns with opposed cutting edges, and are smooth 

 except at their bases. These are distantly sulcate, the separating 

 ridges being acute. The smaller teeth are cones with cutting edges. 

 There are fourteen alveoli and oue i)it in the dentary bone from the pos- 

 terior end to the beginning of the short symphysis. 



Measurements. 



M. 



Lengtli of alveolar series to beginning of symphysis 0. 130 



Diameter alveolus of seventh tooth 008 



Elevation eighth tooth 017 



Diameter at base 0065 



Depth of dentary at base 025 



Elevation of first lower canine 018 



Length crown of second upper canine 017 



Diameter crown at base 007 



Length third cervical, (witli ball) 037 



Diameter of cup, vertical 016 



Diameter of cup, transverse 018 



Length of a posterior dorsal 041 



Diameter of cnp, transverse 026 



Diameter of cup, vertical 022 



Found on the bluffs of Upper Green Eiver. 



This species agrees in some respects with the very brief description 

 given by Marsh for his Crocodilus liodon. He does m>t mention the 

 fluting of the base of the crown so remarkable in this species ; and 



