LIST OF FIGURES IN TEXT 
NO. PAGE 
1. Tracks 35 
2. Footprints of Cheirotherium ........ 39 
3. Portion of a slab of new red sandstone with tracks .... 44 
4. Portion of a slab with tracks 45 
5. Footprints from the Connecticut sandstone ..... 48 
6. Pterygotus anglicus . . . . 31 
7. Silurian Merostomata ......... 36 
8. Ichthyosaurus intermedius ........ 64 
9. Teeth of Ichthyosaurus jplatyodon ...... 66 
10. Skull of Ichthyosaurus latifrons ....... 07 
11. Head of Ichthyosaurus 'platyodon . . . . . . .70 
12. Ichthyosaurus tenuirostris . . . . . . • .70 
13. Mandibles of sea-lizards • • .78 
14. Plesiosaurus macrocephalus ........ 80 
15. Magni6ed section of tooth of Labyrinthodon 89 
16. Skull of a Labyrinthodont, Mastodonsaurus Jwgeri .... 92 
17. Part of skeleton of a Labyrinthodont, Archegosaurus (Decheni) . . 95 
18. Skull of Archegosaurus 97 
19. Labyrinthodonts. 1, a, &, Cricotus. 2. Head of Eryops ... 98 
20. Skull of Eryops macrocephalus ........ 99 
21. Skeleton of a Labyrinthodont, Actinodon ...... 99 
22. A small Labyrinthodont, Ceraterpeton 100 
23. A snake-like Labyrinthodont, DoUchosoma 101 
