LIST OF ILLUSTRATIONS. Vll 



Page 

 FIG. 55. PlesiocJielys valdensis, Lydekker (carapace) ; Wealden, Isle of 



Wight 41 



56. Platychelys olerndorferi, Wagner (carapace) ; Lithographic 



stone, Bavaria . . . . . . . . . . . . 42 



57. CTielone (?) Benstedi, Mantell, sp. (carapace) ; L. Chalk, Kent 43 



58. Miolania Oweni, A. S. Woodw. (skull and tail-sheath) ; 



Newer Tertiary, Australia . . . . . . . . 43 



59. Logger-head Turtle (Thalassochelys caretia, Linn, sp.) ; 



Eecent 44 



60. PsepJiodertna alpinum, Meyer (carapace) ; Trias, Bavaria .. 45 



61. Cryptoclidus Richards oni, Lydekker, sp. (vertebra) ; Oxford 



Clay, Weymouth. . . . ' . . . . 46 



62. Ple-siosaurus Hawkinsi, Owen (pectoral girdle) ; L. Lias, 



Street, Somerset . . . . . . . . . . . . 46 



63. Sauropterygian Mandibles (A, Peloneustes pMlarcTius, Seeley, 

 sp., from Oxford Clay ; B. Thaumatosaurus indicus, Lydek- 

 ker, from Upper Jurassic, India ; and C, Plesiosaurus dolicho- 

 dirus, Conyb., from L. Lias, Lyme Regis) . . . . . . 47 



64. Cryptoclidus oxoniensis, Phillips,sp. (skeleton) ; Oxford Clay, 



Peterborough . . . . . . . . . . . . 48 



,, 65. Skeleton of Plesiosaurus, restored ; L. Lias, Lyme Regis . . 49 



,, 66. Polyptycliodon interruptus, Owen (tooth) ; Greensand, Cain- 

 bridge . . . . . . . . . . . . . . 50 



,, 67. Peloneustes philarchus, Seeley, sp. (tooth) ; Oxford Clay, Bed- 

 ford .. .. 50 



,, 68. Plesiosaurus EawJcinsi, Owen (vertebra) ; L. Lias, Lyme Regis 50 



,, 69. Lariosaurus Balsami, Curioni (skeleton) ; Muschelkalk, 



Perledo 51 



70. Nothosauriis mirabilis, Minister (palate) ; Muschelkalk, 



Germany . . . . . . . . . . . . . . 52 



71. NotJiosaurus mirabilis, Miinster (side view of skull) ; Mus- 

 chelkalk, Germany . . . . . . . . . . 52 



72. Mesosaurus tenuidens, Gervais (pectoral limb) ; Karoo System, 



South Africa 53 



,, 73. ConcJiiosaurus clavatus, Meyer (humerus) ; Muschelkalk, 



Nurnberg . . . . . . ' . . . . . . . . 53 



,, 74. Cyamodus (Placodus) laticeps, Owen (skull) ; Muschelkalk, 



Baireuth . . . . . . . . . . . . . . 54 



75. Dicynodon (palate) ; Karoo System, South Africa . . . . 56 

 ,, 76. Lateral view of skulls of (A), Dicynodon lacerticeps, Owen, 



and (B), Oudenodon Baini, Owen; ibid. .. .. .. 57 



,, 77. TapinocepJialus Atkerstonei, Owen (vertebra) ; ibid... .. 58 

 ,, 78, Galesaurus planiceps, Owen (skull) ; ibid. ,. .. .. 58 

 79. Naosaurus claviger, Cope (vertebra) ; Permian, Texas . . 59 



,, 80. ^Elurosaurus felinus, Owen (skull) ; Karoo System, South 



Africa 59 



81. Empedias molaris, Cope (skull) ; Permian, Texas . . . . 60 



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