TCHTHYOSATTKID^:. 



29 



R. 472 a. A bone regarded as a right femur of a comparatively 

 large individual ; from the Oxford Clay of Stanground. 

 near Peterborough. There are two distal facets ; and the 

 general contour approximates to that of the smaller femur 

 of /. entheciodon (fig. 16). This specimen in respect of 

 mineral condition so closely resembles the femur JSTo. ~R. 

 472 mentioned under the head of Oplitlialmosaurus icenicus 

 (p. 12), that it looks as though it belonged to the same 

 individual. If this should be so, the present specimen 

 would be the humerus, which would have two distal 

 facets while the femur had three. 



Presented by Sir R. Owen, K.C.B., 1884. 



46803. A smaller imperfect left femur ; from the Kimeridge Clay 

 of Foxh angers, near Devizes, Wiltshire. 



Cunninc/ton Collection. Purchased^ 1875. 



Ichthyosaurus ovalis, Phillips \ 



Of large size. Known only by vertebral centra, which in tho 

 dorsal and anterior caudal regions have oval terminal faces, 

 with the vertical diameter longer than the transverse. The type 

 specimens have not been figured. The possibility of this contour of 

 the vertebras having been produced by crushing must be borne in mind. 



Hab. Europe (England). 



Fig. 15. 



Ichthyosaurus ovalis. — Left lateral and anterior aspects of the centrum of a 

 middle dorsal vertebra; from the Kimeridge Clay of the Isle of Port land. 

 £. a, upper, b, lower costal tubercle. 



Geology of Oxford, p. 339 (1871). 



