TAB. Ill 



Plesiosaurus planus, nat. size. 



Fig. 



1. Front view of a centrum from near the posterior part of the neck. 



2. Side view of ditto. 



3. Upper view of ditto. 



4. Under view of ditto. 



5. Front view of centrum of posterior cervical vertebra. 



6. Upper view of ditto. 



7. Upper view of anterior cervical vertebra, from an individual much larger than 



the one to which the vertebra, Tab. I, figs. 1 — 4, belonged. 



8. Front view of ditto, with the surface abraded. 



9. Under view of ditto. 



From the Upper Green-sand, near Cambridge. In the Woodwardian and 

 British Museums. 



