93 



Mcasttreinents. 



Antero-posterior diameter of ilium 



Vertical diameter of ilium 



Antero-posterior diameter of acetabulum 



Length of centrum of third (?) cervical vertehra (from edge of cup to tip 



of ball) 



Height of neural canal, third (?) cervical 



Length of hypapophysis of third cervical 



Length of centrum of a posterior dorsal 



Length of diapophysis (about) 



Length of centruiii of a lumbar 



Vertical diameter of a lumbar 



Breadth of neurapophysis of a lumbar 



095 

 061 



02() 



032 



0095 



OOS5 



040 



032 



046 



029 



027 



CroCODH.US IIKTKKODOX, Cope. 

 Alligator heterodoii, Proc. American Philosophical Society, 1S72, p. 544. 



Represented by a sing-le tooth from the posterior part of 

 the mandibular series. It agrees very closely with the cor- 

 responding tooth of Alligator mississippiciisis, but presents 

 some difterences. The crown is very low, obtuse, and finely 

 striate ; it is compressed and shows a cutting-edge. Its longest 

 diameter is fore and aft ; both this and the transverse diame- 

 ter are proportionately greater than in the modern species. 

 The constriction of the neck is very decided ; the fang is 

 large, and especial Iv thick. 



Mcasiiriiiiriits. 



M. 



Fore-and-aft diameter of crown -oio 



Transverse diameter of crown -007 



Vertical height of crown 



Crocodilus clavis, Cope. 



L'. S. Geol. Survey of Terrs. 1872, p. 612. 



This species is indicated by the remains of a crocodilian 

 larger than Crocodilus Elliotii, but very different from it. The 

 pitting of the dermal scutes, and of all the cranial bones, is 

 deeper than in any other of the Bridger crocodilians in our 

 possession, and ver}^ strongly resembles that in Alligator 

 m ississipp i ens is. 



The mandible has a long symph^-sis, and the alveolar 

 border shows the sudden deep depression just behind it, 



