TAB. XX. 



Plesiosaurus pachyomus, nat. size. 



Fig. 



1. Side view of centrum of cervical vertebra. 



2. Front view of ditto. 



3. Side of centrum of a more posterior cervical vertebra. 



4. Front view of ditto. 



5. Side view of centrum of penultimate cervical vertebra. 



6. Front view of ditto. 



From the Green-sand, near Cambridge. In the Collection of James Carter, 

 Esq., M.R.CS. 



7. Three views of part of a tooth of a Plesiosaurus. 



8. Portion of a similar tooth. 



From the Green-sand, near Shanklin, Isle of Wight. 



