TAB IX. 



Plesiosaurus rostratus. 



Pig. 



1. Skeleton (reduced to scale). 



2. Right dentary bone and teeth, external and internal surfaces of lower jaw, ib. 



3. Crown of the tooth of left dentary, nat. size. 



4. Crown of the tooth of left dentary, nat. size. 



5. Crown of fourth tooth of right dentary, nat. size. 



6. Crown of hind tooth of left dentary, nat. size. 



7. Crown of sixth tooth of right dentary, nat. size. 



8. Crown of hind tooth of right dentary, nat. size. 

 9 Crown of ninth tooth of left dentary, nat. size. 



From the Lower Lias of Charmouth. , In the British Museum. 



