Xi. CETEOSA UR US VERTEBRA. 261 



A larger specimen, measuring 5-4 inches in breadth, and originally 

 16-5 in length, belonged to one of the forward caudals, whose height 

 equals 8, 8-5, and 9 inches. Such a vertebra complete must have 



Diagram XOI. Scale one-tenth of nature. 



I. Postmedial caudal vertebra of Ceteosaurus, seen from above. 2. The same, 

 seen on the left side. 3. The same, seen in front. z. The anterior zygomatic 



processes. The arrow points from the head. 



been not less than 36 inches, and not above 40 inches in height. 

 The branches of this chevron bone touch and interlock ; probably 

 in the other the rami did touch. 



The vertebrae referred to by Professor Owen from Chapelhouse, 

 near Chipping-Norton (eleven, as stated in Geol. Proc. 1841, loc. 

 cit., or ten, as we find in Rep. Brit. Assoc., 1841), are recognized 

 in the Oxford Museum, and agree in general with the description 

 given of them. With one remarkable exception, however. The 

 largest of the vertebras is described as measuring 7 inches across 

 the articular surface at each end of the body, and not less than 

 2 feet in vertical diameter, including the neural and hsemal spines 

 (Brit. Assoc. Rep., 1841). Professor Owen mentions it as being 

 in the collection of Mr. Kingdon, but it is not noticed in the 

 abstract of his paper read to the Geological Society, loc. cit. 



Some other vertebrae, of nearly the same magnitude as those 

 which we possess from Chipping-Norton, and from the same part 

 of the animal, were found at Glympton; and there is one whose 

 place was near to the sacrum, larger than the rest, without locality 

 assigned. The matrix is like that of Chapelhouse. Length, 5* 2 5 

 inches ; breadth of anterior face, 9 inches ; of posterior, 8 inches ; 

 height to the neural canal, 7 inches ; that canal something less 

 than 2 inches in diameter, and nearly cylindrical. Anterior face 

 deeply concave ; posterior nearly flat, reflected on the lower margin 

 for the articulation of the haamapophyses. Sides of the verte- 

 bra concave between the expanded articular faces, Neural arch 



