TAB. XVIII. 



Ichthyosaurus. 



Vertebral centrums ; regional characters. 

 Fig. 



1. Anterior trunk-vertebra, side view. 



2. lb. upper view. 



3. lb. front view. 



4. Middle trunk-vertebra, side view. 



5. lb. upper view. 



6. lb. vertical transverse section. 



7. Posterior trunk-vertebra, side view (Ick. latimanus). 



8. lb. front view (ib.). 



9. Caudal vertebra, side view. 



10. Ib. under view. 



11. Ib. front view. 



12. Posterior caudal vertebra, side view. 



13. Ib. from base of pinnigerous portion, side view (Ick. latimanus). 



14. Ib. under view. 



(All the figures are of the natural size.) 



