PLATE XXVI. 
Ichthyosaurus. 
Fig. 
1. Skull (lacking the lower jaw), back view [Ich. longifrons). 
2. Vertical transverse section of hind end of mandibular ramus {Ich. intermedium. 
3. Ib., somewhat in advance of fig. 2 (ib.). 
4. Ib., across the hinder end of the dentary element (ib.). 
5. Ib., in adv^rce of the mid-length of mandibular ramus (ib.). 
6. Ib., across the anterior end of the surangular and splenial elements (ib.). 
7. Ib., near the anterior end of both mandibular rami (ih*)* 
8. Terminal caudal vertebrae with accidentally deflected pinnigerous end (ib.). 
(All the figures save the last are of the natural size.) 
