LIST OF FIGURES 



FRONTISPIECE. Head of Dinichthys. 



FIG. PAGE 



I, 2. Moving fishes, shark and 



eel 2 



3. Spanish mackerel .... 3 



4. Front view of Spanish 



mackerel . 4 



5-8. Numerical lines of fishes . 5 



9-12. Gills of fishes . . .17,259 



13-19. Air-bladder . . . .22, 265 



20-31. Teeth and scales ... 24 



32-38. Fin spines 29 



39-43. Unpaired fins ... 32, 33 



44-48. Caudal fin 37 



49-54. Paired fins 42 



55-60. Barbels and sense organs 47 

 6 1-68. Mucous canals .... 50 

 69. General anatomy of Cyclo- 



stome 58 



. 69 A. Skeleton of lamprey ... 58 

 70-72 A-D. Bdellostoma, Myx- 



ine, Petromyzon . . 60, 61 



73. Palaeospondylus 65 



74. Pteraspis 66 



75. Palaeaspis 66 



76. 77. Plates of Pteraspis ... 66 



78, 79. Cephalaspis 66 



So-82. Pterichthys 68 



83. General anatomy of shark . 73 

 .84. Skeleton of shark . . .75, 255 



85. Vertebrae of shark .... 76 



86. 86 A. Cladoselache .... 79 

 86 B. Teeth of Cladoselache . . 80 



87. Acanthodes 81 



88. Acanthodes, shagreen . . . 81 

 88 A. Acanthodes, teeth ... 82 

 . Climatius 82 



FIG. PAGE 



90. Pleuracanthus 83 



90 A. Teeth of Pleuracanthus . 84 



90 B. Head roof of Pleuracanthus 84 



91. Cestracion 85 



92. Chlamydoselache .... 87 



93. Heptanchus 88 



94. Squalus 89 



95. Alopias 89 



96. Lamna 90 



96 A. Cetorhinus 90 



968. Lsemargus 91 



97. Squatina 91 



98. 98 A. Pristis 92 



99. Pristiophorus 93 



100. Rhinobatis 93 



101. Raja 94 



102. Torpedo 95 



IO2A. Dicerobatis (Cephalop- 



tera) 96 



103. Shark phylogeny .... 98 



104. General anatomy of Chimaera 100 



105. Skeleton of Chimaera . . 102 

 105 A. Ischyodus 104 



1 06. Myriacanthus 105 



io6A. Squaloraja 105 



io6B, c. Derm plates of Myria- 

 canthus 105 



107-112. Dental plates of Chimse- 



roids 106 



1 1 3-1 1 6 A. Spines and claspers 



of Chimaeroids .... 107 



117. Harriotta 108 



118. Callorhynchus 109 



119. Chimaera no 



1 20. Chimaera, young . . . .ill 



121. General anatomy of lung-fish 117 



