H. GOVIER SEELEY ON CROCODILU8 ICENICUS. 439 



has an aspect as though placed slightly below its proper position 

 on the centrum ; its external surface is rather concave behind the 

 ball. The transverse diameter of the centrum at one inch from the 

 posterior extremity is lg inch. The neural suture is straight, 1| 

 inch in length. The neural arch is remarkable for its length 

 and for the small extent to which it is notched in front and behind 

 for the vertebral nerves, its least length being fully lj| inch. It 

 rises vertically and continuously with the side of the centrum ; and 

 at a height of about 1J inch from the base of the centrum gives off 

 the compressed transverse processes, which are almost entirely broken 

 away. This process is continuous in front with the anterior zygapo- 

 physis, the articular facet of which is not horizontal, but looks a little 

 inward as well as upward ; the facets appear scarcely to project 

 forward in front of the anterior articular margin. The transverse 

 processes at the base, as preserved, have an antero-posterior measure- 

 ment of 1|- inch. Behind the process is a concave notch, posterior 

 to which the postzygapophysis is produced ; across the notches the 

 measurement is 1£ inch. There is a slight depression below the 

 notch, bounded in front by a ridge directed outward and forward. 

 As preserved, the transverse processes, which were horizontal, 

 measure 2\ inches from side to side. The neural arch was greatly 

 compressed above the transverse platform. The neural spine is frac- 

 tured at a height of less than 3 inches from the base of the centrum ; 

 it measures lj inch from front to back. The neural canal (which 

 is obscured in front) appears to have been remarkably small ; from 

 side to side behind, the neural arch measured 1 inch. 



This vertebra is the 6th or 7th dorsal. The depression of the 

 posterior articular ball, and its perfect convexity, are the chief points 

 in which it differs from existing species. 



The remains indicate an animal about 16 feet long. 



I have seen no other vertebrate fossil from a secondary stratum 

 in which the bones preserved so closely resemble those of an exist- 

 ing type. 



