PLATE XXL 
Ichthyosaurus. 
Typical vertebra. 
Fig. 
1. First or atlas vertebra. 
2. Trunk- vertebra. 
3. Pelvic vertebra. 
4. Caudal vertebra. 
5. Terminal or pinnigerous vertebra. 
(These figures are less than the natural size.) 
6. Neural arches of trunk-vertebrm, side view. 
7. Portions of pleurapophyses of trunk-vertebrae, outer side view. 
(These figures are of a small specimen, natural size.) 
