VI LIST OF ILLUSTRATIONS. 



Page 



Fig. 27. — Ignanodon Jiernissartevsis, Boulenger (skull); Wcaldeii, 



Beriiissart . , . . . . . . . . . . . . 23 



,, 28. — Teeth of (A, B) Trachodon caiitahrigieii.sis, Lydekker, from 

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

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



,, 29. — FalcEophls tyfhaua, Owen (vertebra) ; London Clay, Sheppey 25 



,, 30. — Paleri/x rlwmbifer, Owen (vertebra) ; Eocene Phosjilioiites, 



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



,, 31. — Dentary bone of Angnoid Lizard ; ibid.. .. .. ..26 



,, 32. — T'a;'fl»«s if«//a/p»6/*, Daudin (vertebra and maxilla) ; Pleisto- 

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



,, 33. — Platecarpus (pectoral limb) ; Cretaceous, X. America . . 27 



,, 34. — Platecarpus curtiro.sii-iSjCo'^e (sknW) ; ibid. .. .. .. 28 



,, 35. — Tooth of iiorfoM ; U. Cretaceous, Maestricht .. .. ..28 



,, 36. — Mosasaums Ca»«jje/*t, Meyer (jaws) ; ibid. .. .. ..29 



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



„ 38. — Ichthijosaiirus communis, Conyb. (skull) ; L. Lias, Lyme Regis 32 



,, 39. — Ichthi/osaunis trigonv.s, Owen (vertebra) ; Kimmeridge Clay, 



Stanton . . . . . . . . . . . . . . . . 32 



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



Clay, Wilts .. ..32 



,, 41. — Ichthyosaurus latifrons, Kouig (skidl) ; L. Lias, Barrow-on- 



Soar • . . . . . . . . . . . . . . 33 



,, 42. — Ichthyosaurus zetlandicus, Seeley (skull) ; \J. Lias, Nor- 

 mandy . • . . . . . . . . . . . . . . 33 



„ 43. — Skeleton of Ichthyosaurus (restored) ; L. Lias, Lyme Eegis . . 34 



„ 44. — Teeth of (A, B) Ichthyosaurus plutyodon, Conyb., and (C) 



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



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



a,\i(\. {W) Ichthyosaurus communis, Corvyh. ; ibid. .. .. 36 



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

 dins, Cony\). ; ibid. .. *• .. .. .. .,37 



,, 47. — Trionyx Gergensi, Meyer (carapace) ; L. Miocene, May encc.. 38 



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



India 39 



,, 49. — Cachuga ^ec^?<wj. Gray (plastron) ; ibid. .. .. .. 39 



,, 50. — Shiiwchelys cantahrigiensis, Lydekker (skull) ; Greensand, 



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



., 51. — Argillochelys antiqua, Ivtinig, sp. (skull) ; Loudon Clay, 



Sheppey . . . . . . . . . . . . . . . . 40 



,, 52. — Nicoria tricarinata, Tar. sivaletisis, Lydekker (carapace) ; 



Pliocene, Siwalik Hills, India .. .. .. .. ,.40 



,, 53. — PJeurosternum Bullochi, Owen (plastron) ; Purbeck Beds, 



Swanage . . . . . . . . . . . . . . . . 40 



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



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



