324 GEOLOGY OF THE ISLE OF WIGHT. 



are sabre-shaped, with trenchant serrated edges. 

 The original was probably carnivorous, and nearly 

 thirty feet in length. As it was contemporary 

 with the Iguanodon and several other large sau- 

 rians, it may have preyed on their young and on 

 the lesser reptiles. Many teeth, vertebras, and por- 

 tions of the femur of this animal, have been found in 

 the Island. The vertebrae are not subquadrangular 

 like those of the Iguanodon, but are cylindrical at 

 the ends and contracted in the middle, and have a 

 very smooth surface. The femur is nearly cylin- 

 drical and slightly bowed ; it has two large rounded 

 prominences, or trochanters of nearly ecpual size, 

 below the head of the bone ; it may therefore 

 easily be distinguished from the thigh-bone of the 

 Iguanodon. 



Cetiosaurus. — This extinct reptile, as its 

 name imports, bore some resemblance to the Ceta- 

 ceans. The vertebrae are almost circular at the 

 ends, and have a very short body ; the front arti- 

 culating surface is nearly flat, and the other 

 concave, in the dorsal vertebra?, but in the caudal 

 both ends are deeply hollowed ; they are very large, 

 often eight inches in diameter. By these cha- 

 racters the vetebrae of the Cetiosaurus may easily 

 be recognised. I have obtained several from the 

 weald clay at Sandown and Brook. The original 



