CROCODILIA. 153 



pitted, but the dentaiy has remote shallow pits on the outer face, and shal- 

 low grooves below. Dentition very characteristic. There are two very long 

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

 somewhat backwards ; these are preceded, after a space, by a medium-sized 

 tooth, which, after a similar space, is preceded by another long tooth. Ante- 

 rior to this the alveoli are lost. Two very long, 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, vary- 

 ing 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 sulcata with wide grooves, 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 posterior end to the beginning of the 

 short symphysis. 



Measurements. 



M. 



Length of alveolar series to beginniug of symphysis 130 



Diameter of alveolus of seventh tooth 008 



Elevation of eighth tooth 017 



Diameter of eighth tooth at base 0065 



Depth of dentary at base 025 



Elevation of first lower cauiue 018 



Length of crown of second upper cauiue 017 



Diameter of crowu at base 007 



Length of third cervical (with ball) 037 



Diameter of cup, vertical 016 



Diameter of cup, transverse . 018 



Length of a posterior dorsal 041 



Diameter of cup, transverse 026 



Diameter of cup, vertical 022 



Found on the bluffs of the Upper Grreen River, of the Bridger epoch. 



This species agrees in some respects with the very brief description 

 given by Marsh for his Crocodilus liodon. He does not mention the fluting 

 of the base of the crown so remarkable in this species ; and states the ver- 

 tebrge to be "strongly rugose" near the extremity, a character not seen in 

 the present animal. 



The Crocodilus suhulatus was about as large as the Mississippi alligator 



