438 H. GOVIER SEELEY ON CROCODILTJS ICENICUS. 



sides, where a concave area is terminated posteriorly by a ridge 

 arising from the diapophysis; which runs upward and backward, 

 presumably to the faces of the posterior zygapophyses, which are 

 broken away. 



The neural canal somewhat excavates the middle of the neural 

 surface of the centrum. The posterior outlet of the neural canal 

 appears formed of two pairs of sides — a short pair below, converging 

 to the middle of the centrum, and a long pair, 1 J inch in length, 

 converging upward and prolonged in the notch between the zygapo- 

 physes. The posterior aspect of the neural arch below the zygapo- 

 physes is flattened. The flattened surfaces are -J- inch broad, and look 

 obliquely outward and backward ; they converge somewhat upward, 

 and terminate inward in the rounded margin of the neural canal, 

 upward in the posterior zygapophysial ridge, and outward and for- 

 ward in the diapophyses. The length of the neural suture is 1| 

 inch. 



The neural spine appears to have been compressed, but is entirely 

 broken away. 



The diapophyses are obliquely ovate, J inch long and | inch 

 deep ; they are situate rather nearer the front than the middle of 

 the side of the centrum. The transverse measurement through the 

 diapophyses, as preserved, would be about 3 inches. 



The lateral unarticular part of the centrum is about 1| inch 

 long. Posterior to this region the centrum terminates in a large 

 rounded articular ball, 1| inch wide, not quite so deep, and extend- 

 ing backward for fully j inch. The greatest width of the centrum 

 behind the posterior articulation is 1-| inch. 



The side of the centrum carries on its upper half, at less than 

 half an inch behind the anterior articular margin and extending 

 upward to the neural arch, the vertically ovate parapophysis, which 

 as preserved is T 9 ¥ inch high and T 6 F inch broad. Its lateral projec- 

 tion is probably but slightly worn. The width of the vertebra 

 through the parapophyses is lg inch. 



The sides of the centrum below the parapophyses are slightly con- 

 cave in length, somewhat flattened ; and towards the middle of the 

 base of the centrum they form a well rounded median surface, con- 

 cave in length, which in the anterior half inch is prolonged down- 

 ward into a small hypapophysis, now broken away. 



The measurement from the rounded base of the centrum to the 

 upper margin of the anterior zygapophyses is nearly 3 inches. 



This vertebra is probably the last cervical. It differs from that 

 of existing Crocodiles in the large size of the parapophyses, in the 

 distinct anterior notch in the neural arch for the vertebral nerve, 

 and the perfect convexity of the articular ball. 



The dorsal vertebra has the centrum elongated, compressed from 

 side to side, and well rounded on the under surface. It is 2 \ 

 inches long, the lateral unarticular part being 1J inch, while the 

 remainder is occupied by the well rounded, convex, posterior arti- 

 cular ball. The anterior cup is apparently circular, and measures 1| 

 inch from side to side. The ball is \\ inch from side to side, and 



