3 



inches 



- 3 



a 



- 10 



lines. 



- 8 



inches. 



- 3 



(( 



- 2: 



in. 2 1. 



- 2 J inches. 



- 8 



(I 



- 22 



lines. 



- 14 



a 



- 1 



inch. 



138 LEIDY'S DESCRIPTION OF A NEW SPECIES OF CROCODILE. 



Measurements. 



Length of the body from the bottom of the concavity to the summit of the convexity, 

 Length laterally, exclusive of the convexity, ..... 



Depth of concavity, ........ 



Vertical diameter of concave extremity has been about, .... 



Transverse tc a .... 



Vertical diameter of convexity at base, ...... 



Transverse '* " ...... 



" " body at middle from one suture to the other, ... 



Antero-posterior breadth of base of spinous process, . . _ 



Vertical diameter of spinal foramen, ...... 



Transverse ic ic ...... 



The other vertebra, represented in figure 5, consists of the body only with the 

 abutments of the neural arch and a small portion of the right anterior articular 

 process. It is more compressed at the sides than in Crocodilus gangeticus, and 

 therefore appears relatively deeper and narrower. 



Measurements. 



Length of the body from the bottom of the concavity to the summit of the convexity, 3^ inches. 



Length laterally, exclusive of the convexity, has been about, - - - - 3J^ " 



Vertical diameter of convexity has been about - - - - 3 " 



Transverse u u u .... 3 " 



" diameter of body at middle from one lateral suture to the other, - - - 2^ " 



The fragment of rib consists of the vertebral third of one of the posterior ribs. It 

 is thick and strong in accordance with the size of the animal, but presents nothing 

 peculiar. 



The ungual phalanx appears, so far as I can ascertain from comparison with those 

 of Alligator lucius, to be the first of the thumb. It is of large size and very robust. 

 Its base is trilateral with rounded angles, and presents a transverse concave 

 articulating surface. The depressions for the lateral ligaments just above the 

 condyles are remarkably deep. Just postero-superiorly to one of the depressions is 

 an oval tubercle for tendinous attachment. 



Measurements. 

 Length of the phalanx, - -- - - - - - - 2]- inches. 



Greatest breadth at base, - - - - - - - - -15 lines. 



" depth of base, ........ 13" 



Breadth of condyles, ......... iQj " 



For the species to which the fragments of the skeleton described belonged, I 

 propose the name of Crocodilus antiquus. 



REFERENCE TO PLATE XVI. 



Figs. 1, 2, ii, represent teeth of Crocodilus antiquus of the natural size. 

 Figs. 4, 5, vertebrae of do., half the size of nature. 



