68 SYSTEMATIC PALEONTOLOGY 



" The second specimen of the teeth, represented in Fig. 3, consists 

 of a crown only, which is as long as that of the former tooth but slightly 

 more slender, and the enamel is a little smoother, and its ridges, though 

 not so elevated, are longer. 



" The color of the dentinal substance and osteo-dentine of the teeth 

 is umbreous brown or chocolate; the enamel is lighter colored, glisten- 

 ing, and delicately undulating and interruptedly striate. 



Measurements. 

 First specimen: 



Thickness of the broken edge of the pulp cavity, 



three inches below the summit of the crown . 1^ lines (3 mm.) 

 Probable length of the tooth in its perfect condi- 

 tion, if the parietes of the pulp cavity de- 

 creased in thickness at the same rate as a 

 corresponding tooth of Crocodilus bipor- 



catus 5 inches (125 mm.) 



Length of crown laterally • 1^ inches (37 mm.) 



Lateral diameter of base of crown 10 lines (20 mm.) 



Transverse diameter of base of crown 9J lines (18 mm.) 



Lateral diameter of fang 12 lines (24 mm.) 



Transverse diameter of fang 10| lines (21 mm.) 



Second specimen: 



Length of crown laterally 1^ inches (37 mm.) 



Lateral diameter at base of crown 9 lines (18 mm.) 



" Dr. Wyman ^ has described and figured the crown of a tooth of a 

 Crocodile from the Miocene, at Richmond, Virginia, which corresponds 

 to the above descriptions, and probably belong to the same species. 



" In relation to the specimens of the concavo-convex vertebrae, their 

 size indicates a species of crocodile probably no less than eighteen feel 

 in length. 



" One of the specimens rei^resented in Fig. 4, I judge to be an 

 anterior dorsal, probably the second; the other is a posterior dorsal, 

 or a lumbar vertebra. 



1 Amer. Jour. Sci., ser. ii, toI. x, 1850, p. 233, figs. 8a and 8b. 



