TAB. X. 



Plesiosaurus rostralus, nat. size. 



Fig. 



1. Side view of the fifteenth cervical vertebra. 



1a. Section of neural spine. 



2. Posterior articular surface of centrum of cervical vertebra. 



3. Inferior surface of centrum and'pleurapophyses. 



4. Posterior articular surface of centrum of cervical vertebra. 



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



J 



