TAB. V. 

 Polyptychodon interruptus. 



Fiz. 



1 . Centrum of posterior cervical vertebra, side view. 



2. Ditto, under view. 



3. Fragment of a dorsal rib. 



These figures, of the nat. size, are from specimens in the Woodwardian 

 Museum of the University of Cambridge ; and are from the Upper 

 Green-sand formation near that town. 



