Vlll 
LIST OF ILLTTSTEATIONS IN TEXT. 
FIG. PAGE 
22. Skull and mandible of Hyperodapedon gordoni, from the 
Trias of Elgin. (After A. S. Woodward) ... 26 
28. Dorsal Vertebra of Naosaurus claviger, from the Permian 
of Texas. (After E. D. Cope) ..... 27 
24. Skull and mandible of Aelurosaurus felinus, from the Karoo 
Formation of South Africa. (After Owen) ... 28 
25. Skull of Tritylodon longcevus , from the Karoo Formation of 
South Africa. (After Owen) ..... 29 
26. Skulls of Dicynodon lacerticeps and Oudenodon baini, from 
the Karoo Formation of South Africa. (After Owen) . 30 
27. Skull of Cyamodus laticeps, from the German Muschelkalk 31 
28. Vertebra of Plesiosaurus , from the Lower Lias of Lyme 
Regis .......... 32 
29. Skeleton of Plesiosaurus macrocejphalus, with restored out¬ 
line of body and tail-fin, from the Lower Lias of Lyme 
Regis .......... 33 
30. Tooth of Polyptychodon interruptus, from the Cambridge 
Greensand . . . . . . . .34 
31. Sauropterygian mandibles ...... 35 
32. Skull of Nothosaurus mirabilis. from the German Mus¬ 
chelkalk ......... 36 
33. Skeleton of Lariosaurus balsami v from the Italian Mus¬ 
chelkalk ......... 36 
34. Skeleton of Ichthyosaurus communis , with restored outline 
of body and fins, from the English Lower Lias . . 37 
35. Skull of Ichthyosaurus zetlandicus, from the Upper Lias of 
Normandy. (After Zittel) ...... 38 
36. Tooth of Ichthyosaurus campylodon, from the Lower Chalk 
of Folkestone ........ 38 
37. Vertebral centrum of Ichthyosaurus , from the Kimmeridge 
Clay of Wiltshire........ 39 
38. Paddles of Ichthyosaurus intermedius , from the Lower Lias 
of Lyme Regis ........ 39 
39. Carapace of Hardella thurgi, from the Lower Pliocene of 
the Siwalik Hills, India ...... 41 
40. Skeleton of the existing Logger-head Turtle (Thalassochelys 
caretta) ......... 42 
41. Carapace of Chelone benstedi, from the Chalk of Kent. . 43 
42. Skeleton of Cryjytobranchus scheuchzeri (“ Homo diluvii 
testis ”), from the Upper Miocene of Oeningen, 
Baden ......... 46 
43. Skull of Mastodonsaurus giganteus, from the Lower Keuper 
of Wurtemberg. (After E. Fraas)..... 47 
44. Skull of Bothricejys huxleyi , from the Karoo Formation of 
South Africa. (After R. Lydekker) .... 48 
45. Vertebra of Euchirosaurus rochei, from the Lower Permian 
of France. (After A. Gaudry) ..... 49 
46. Footprints of Cheirotherium barthi, from the Bunter Sand¬ 
stone of Saxony ........ 51 
47. Restoration of Birkenia elegans , from the Downtonian of 
Lanarkshire. (After R. H. Traquair) .... 54 
48. Restoration of Thelodus scoticus, from the Downtonian of 
Lanarkshire. (After R. H. Traquair) ... 55 
