ICHTHYOSAURI!) JE. 



99 



R. 878. A fragment of the upper part of the interorbital region of 

 the cranium of a very large individual ; from Lyme-Regis. 

 Both the external and internal aspects of the bone are 

 shown, as well as the complete parietal foramen. 



No history. 



R. 1193. The nearly entire left quadrate of a very large individual ; 

 from Lyme-Regis. This specimen agrees approximately 

 in size with the corresponding bone of the skull jN t o. R. 218. 



No history. 



2149*. The basioccipital of a very large individual ; from Lyme- 

 Regis. Hawkins Collection. 



29016. Slab showing three entire plates of the sclerotic ring ; from 

 Lyme-Regis. Purchased, 1854. 



33283. A small tooth ; from Lyme-Regis. Figured in the ac- 

 (Fig.) companying woodcut. Purchased, 1852. 



Fig. 31. 



Ichthyosaurus platydon. —Lateral and profile views of the tooth No. 33283. \ 



33283 a. Seven similar teeth, not improbably belonging to the same 

 individual; from Lyme-Regis. Purchased, 1852. 



33283b. The crown of a considerably larger tooth; from Lyme- 

 Regis. Purchased, 1852. 



ii 2 



