154 THK WASATCH AND BUIDGEU FAUN^. 



Crocouilus polyodon Cope. 



Dijilocynodut polyodon Cope, Annual Report U. S. Geol. Surv. Terrs., F. V. Haydcn iu charge, 1872 



(1873), p. til4. 



Plate XX^^^ figs. 1-2. 



Represented by portions of cranium and teeth, with probably some 



vertebrae found close to them. This crocodile is similar in size to the G. 



subulatus or our existing alligator. It differs much from the last in the 



arrangement of the teeth. There is one prominently lai-ge canine opposite 



the symphysis (in C. suhidatus this tooth is opposite the posterior end of the 



same), which is followed by nine very small teeth, whose round alveoli are 



only separated by very thin walls. Following the last of these immediately, 



is another very large tooth, with nearly round alveolus, which is closely 



succeeded by other smaller teeth of larger size than those in fi-ont of it, 



and not differing in this respect among themselves. The crowns of the 



teeth are cylindric at the base, and have a double ridge on the anterior outer 



aspect. The enamel is obsoletely nigose striate at the base. The external 



surface of the dentary bone is deeply and coarsely pitted ; at its anterior 



part the pits are close, deep, and small ; on the inferior face they are deep 



short grooves. There is a seines of close small foramina along the inner 



side of the alveoli. 



Measurements. 



M. 



Depth of symphysiii 014 



Diameter of "anterior canine tooth" 008 



Distance of same from median " canine" 030 



Depth of dentary hone at latter 027 



Width of ramus at anterior canine 025 



This species differs in many respects from the one last described. The 

 teeth anteriorly are much more closely placed, and the anterior and middle 

 canines are less separated, and more numerous small teeth occupy the interval. 

 The splenial bone has a larger share in the symphysis, and the sculpture is 

 much more profound. The teeth are not fluted. 



The type specimen was found on the bluffs of Upper Green River by 

 the writer. 



Crocodilus ackr Cope. 



Plato XXIII, figa. 1-2. 



This species is represented by a perfect skull wliicli Inoks the lower 

 jaw. In its general form this skull resembles the existing Crocodilus acutus, 



