254 



Bottosaukus(?) humilis, Leidy. 



Crocodilus hum'rfh, Leidy, Proceedings of the Academy of Natural Sciences, Philadelphia, 

 1856, p. 7:3 (teeth only). Transactions of the American Philosophical Society, XII, ]>. 

 146. Plate XI, figs. 9-19. 



Bad lands of Montana (Judith River). 



GAVIALIS, Merrem. 



Gray, Catalogue of the Tortoises, Crocodiles, etc., British Musenm, 1844, p. 57. 



Gavialis featerculus, Cope. 



Bi/posaurus fraterculus, Cope, Extinct Batrachia and Reptilia of North America, 1869, p. 82. 



This species was established on a portion of the mandible. Since the date 

 of description, parts of two other individuals have come into my possession, 

 one of which includes considerable portions of the mandible, with teeth, 

 numerous vertebrae from all parts of the column, humerus, ischium, pubis 

 etc. These remains indicate that this species is a procoelian crocodile allied 

 to Holops, but having the long, produced hypapophyses of the cervical verte- 

 brae of Gavialis. From the Tertiary genus Thecachampsa, it differs in the 

 simplicity of the dental crowns. 



The mandibular ramus exhibits a large foramen on the outer side, bound- 

 ing the angular bone above, and a large dental foramen on the inner side. 

 The outer faces of the dentary exhibit rather distant narrow grooves; the 

 outer face of the angular is coarsely articulate or pitted. The cup of an 

 anterior cervical is round; of a posterior, slightly depressed. The hypapophy- 

 sis is acute, prominent, and directed well forward. The caudal vertebrae are 

 large, indicating a large tail. The humerus is much like that of Holops breri- 

 spin is. 



This gavial is the least of the Crocodilia of the Cretaceous. The speci- 

 men described is adult, and considerably less than the smallest of the Holops 

 brevispinis, the next larger. 



Grreensand, Xo. ">. from Birmingham and Hornerstown, New Jersey. 



SAUROPTERYGIA. 

 PIRATOSAURUS, Leidy. 



Pihatosaurus plicaits, Leidy. 



Cretaceous Reptiles of North America, p. 2D, Table XIX, lig. - : . 



Cretaceous of the Red River. Minnesota. 



