H. GOVIEK SEELEI ON CROCODILUS ICENICUS. 437 



46. On Crocodilus icenicus (Seeley), a second and larger Species 

 of Crocodile from the Cambridge Upper Greensand, con- 

 tained in the Woodivardian Museum of the University of Cam- 

 bridge. By Harry Govier Seeley, Esq., F.L.S., F.G.S., &c, 

 Professor of Geography in King's College, London. (Read 

 June 21, 1876.) 



It is a curious coincidence that the evidence of the fossil now 

 described, like that of Crocodilus cantabrigiensis, consists of ono 

 cervical and one dorsal vertebra. The vertebras in this species, 

 however, are associated ; and their striking resemblance to existing 

 Crocodiles had, I believe, already been recognized by Mr. Walter 

 Keeping. 



The centrum of the cervical vertebra is 2\ inches long, and is 

 divided from the neural arch by a rather deep suture, more than 

 usually well marked by the neural arch projecting laterally a little 

 beyond the centrum. In front the proccelous articulation is as deeply 

 cupped as in any recent species. The cup is circular, about 1 J inch 

 in diameter ; it was surrounded by a narrow border, now somewhat 

 worn, so that the transverse diameter of the centrum, which was 

 about 1|| inch, cannot be exactly determined. Its depth appears to 

 have been as great — though, as the small anterior hypapophysis is 

 broken away, the depth as preserved is only \\ inch. 



The neurapophyses are very strong. As they rise from the cen- 

 trum they are directed outward and upward, constricted and rounded 

 anteriorly above the centrum for the passage of the cervical nerve. 

 The neurapophyses are constricted between the par apophyses and 

 diapophyses, as well as between the diapophyses and zygapo- 

 physes. The least measurement of the neural arch from front to 

 back is rather more than one inch. 



The anterior zygapophysial facets are inclined at an angle of about 

 45° looking upward and inward ; they measure about | inch from 

 front to back, and about 1 inch from below upward. Only that 

 on the left side is preserved : it is smooth, its anterior margin hardly 

 projects in front of the anterior face of the centrum, and its pos- 

 terior margin is hardly behind the anterior margin of the diapo- 

 physis. The width between the anterior zygapophyses was about 

 2| inches. The inner margin of the facets of the zygapophyses 

 descends below the top of the neural canal, which in front is sub- 

 triangular. As usual, there is an interspace between the facets, due 

 to the neural spine being placed further backward; and from the 

 middle of this area the vertical slightly elevated anterior margin of 

 the neural spine arises. On the side of the neural arch the zyga- 

 pophyses laterally curve downward and backward to the diapophyses, 

 which project prominently. Above the diapophyses and behind the 

 anterior zygapophyses the sides of the neural arch are considerably 

 compressed, measuring 1§ inch transversely at the shoulders of the 



