XI. 



CETEOSA UR US VERTEBRAE. 



265 



In this series the first (a) has the body contracted and sub- 

 prismatic by the formation of three lateral facettes ; a large, oval, 

 vertical foramen in the neural canal, behind the centre. It may 

 be regarded as occupying a place corresponding to the i8th in 

 crocodile, 37th in iguana, 65th in monitor. A narrow vertical 

 foramen is remarked in the neural canal of b. At g the body 

 becomes hour-glass shaped. These vertebrae are obviously longer 

 than those from Chapelhouse; on the average by an inch, while 

 the diameters are not materially different. 



The fine vertebra from Buckingham, already mentioned as 



Diagram XCV. Middle Caudal Vertebra of Ceteosaurus, from Glympton. One-filth 

 of nature, i. Seen on the right side. 2. Seen from above. 3. Seen from below. 



represented by an excellent cast, was not far from the beginning 

 of the tail, and shews the diapophysis prominent about an inch. 

 The length is 6-0 inches; the height 6-0; the breadth 7-0. The 

 articulating faces are concave to the depth of 0-4. The lower edges 

 are revolute; the posterior much so, with divided haemapophysial 

 cicatrices. The neural canal is contracted in the middle to half 

 an inch, but expands towards each edge. The neural spine is 

 broken off. This vertebra may be regarded as next in front of 

 that represented in Diagram XC. 



From what has been said, it is apparent that the caudal vertebrae 



