VI LIST OF ILLUSTRATIONS. 



Page 



YiGr. 27. Igiianodon Bernissartensis, Boulenger (skull) ; Wealden, 



Bernissart . . . . . . . . . . . . . . 23 



,, 28. Teeth of (A, B) Trachodon cantabrigiensis, Lydekker, from 

 Cambridge Greensand, and (C), Trachodon Foulki, Leidy, 

 from U. Cretaceous, New Jersey . . . . . . 24 



,, 29. Palceophis typhceus, Owen (vertebra) ; London Clay, Sheppey 25 



30. Paleryx rhombifer, Owen (vertebra) ; Eocene Phosphorites, 



Caylux, France . . . . . . . . . . . . 25 



,, 31. Dentary bone of Anguoid Lizard; ibid. . . . . . , . . 26 



,, 32. T'aranus Jjengalensis, Daudin (vertebra and maxilla) ; Pleisto- 

 cene, Madras . . . . . . . . . . . . 2G 



,, 33. Platecarpus (pectoral limb) ; Cretaceous, K". America . . 27 



,, 34. Platecarpus curtirostris, Cope (skull) ; ibid. .. .. ..28 



35. Tooth of Liodon ; L T . Cretaceous, Maestricht .. .. ..28 



36. Mosasaurus Camperi, Meyer (jaws) ; ibid. .. .. .. 29 



,, 37. Hyperodapedon Gordoni, Huxley (skull) ; Trias, Elgin . . 30 



38. Ichthyosaurus communis, Conyb. (skull) ; L. Lias, Lynie Kegis 32 



,, 39. Ichthyosaurus trigomts, Owen (vertebra); Kimmeridge Clay, 



Stanton 32 



,, 40. Ichthyosaurus entheciodon, Hulke (vertebra.) ; Kimmeridge 



Clay, Wilts . . . .'.32 



,, 41. Ichthyosaurus latifrons, Konig (skull) ; L. Lias, Barrow-on- 



Soar ,33 



,, 42. Ichthyosauwis zetlandieus, Seeley (skull) ; L T . Lias, Nor- 

 mandy . . . . . . . . . . . . . . 33 



43. Skeleton of Ichthyosaurus (restored) ; L. Lias, Lyme Regis . . 34 



,, 44. Teeth of (A, B) Ichthyosaurus platyodon, Conyb., and (C) 



Ichthyosaurus communis, Conyb. ; ibid. .. .. ..35 



,, 45. Pectoral limbs of (A) Ichthyosaurus Conyleari, Lydekker, 



and (B) Ichthyosaurus communis, Conyb. ; ibid. . . . . 36 



,, 46. Pectoral (A) and pelvic (B) limbs of Ichthyosaurus interme- 



dius, Conyb. ; ibid. . . * - 37 



,, 47. Trionyx Gergensi, Meyer (carapace) ; L. Miocene, Mayence. . 38 



,, 48. Hardella Thurgi, Gray (carapace) ; Pliocene, Siwalik Hills, 



India 39 



,, 49. Cachuga tectum, Gray (plastron) ; ibid. .. .. .. 39 



,, 50. Ehinochelys cantabrigiensis, Lydekker (skull) ; Greensand, 



Cambridge . . . . . . . . . . . . 40 



., 51. Argillochelys antiqua, Konig, sp. (skull); London Clay, 



Sheppey .. .. .". 40 



,, 52. Nicoria tricarinata, var. sivalensis, Lydekker (carapace) ; 



Pliocene, Siwalik Hills, India . . . / 40 



53. Pleurosternum Bullocki, Owen (plastron) ; Purbeck Beds, 



Swanage . . . . . . , , .... . . 40 



54. Argillochelys cuneiceps, Owen, sp. (skull) ; London Clay, 



Sheppey . . . . . . . . . . . . . . 41 



