GEOLOGICAL SURV'eY OF THE TERRITORIES. 61 



o 



thc^o arc of subcyliurlrio and short conic crown, which is superficially 

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

 Upper Green Eiver. 



Crocodilus grinnellii, Marsh. 



Aniericaii Journal Sci. Arts, 1871, June. 



Cranium from South Bitter Creek. 



Crocodilus liodon, Marsh. 



Loc. cit. 

 From various localities. 



DIPLOCYXODUS, Pomel. 



DiPLOCYNODTJS SUBULATUS, Cope. 



Crocodilus (Ichtlrjosiichun) suhnlatHs, Cope. Proceediugs American Philosophical So- 

 ciety, 1B72, p. 554, (October 12.) 



Some of the cervical vertebrne without hypopophjses. 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 pitted, but the dentary has remote shallow pits on the outer 

 face and shallow grooves below. Dentition something like that of 

 D\plocyno<lus raicUii from France. There are two very long canine-like 

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

 what backward; 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 one pit in the dentary bone from the pos- 

 terior end to the beginning of the short symphysis. 



Measuremenis. 



M. 



Length of alveolar series to beginning of symphysis 0. 130 



Diameter alveolus of seventh tooth COS 



Elevation eighth tooth 017 



Diameter at base 0065 



Depth of dentary at base . Q->b 



Elevation of lirst lower canine 018 



Length crown of second upper canine 017 



Diameter crown at base 007 



Length third cervical, (with ball) 037 



Diameter of cup, vertical 016 



Diameter of cup, transverse 018 



Length of a iiosterior dorsal 041 



Diameter of cup, transverse 026 



Diameter of cup, vertical 022 " 



Found on the bluffs of Upper Green River. 



This species agrees in some respects with the verj^ brief description 

 given by Marsh for his Crocodilm Uodon. He does not mention the 

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



