LIST OF ILL US TRA TIONS. x v 



PAGE 



Fig. 62. Ostrea virginiana 264 



63. Diagrammatic representation of the segments of the 



leech 270 



64. Diagrammatic representation of the rings of a primi- 



tive crustacean 271 



65. Diagrams of hand of Crangon and of Astacus . . . 274 



66. Elbows of man and horse 280 



67. Elbow of horse . . 281 



68. Periptychus rhabdodon Cope, showing foot .... 288 



69. Hind foot of Poebrotherium labiatum Cope .... 290 



70. Hind foot of three-toed horse 290 



71. United first bones of two middle toes of deer-antelope 291 



72. Wrist-joints at distal extremity of fore arm . . . 292 



73. Elbow-joint of Crocuta maculata L 294 



74. Elbow-joint of chimpanzee 295 



75. Elbow-joint of Cervus elaphus 296 



76. Cervus canadensis in motion 297 



77. Cervus elaphus 298 



78. Diagram of carpus of a Taxeopod, of a diplarthrous 



ungulate 299 



79. Raccoon pacing 299 



80. Rhinocerus unicornis carpus 300 



81. Eqiius caballus fore foot 300 



82. Gazella dorcas 301 



83. Pes of Merychochecrus montanus and Bos taurus . . 307 



84. Anterior feet of primitive Ungulata 308 



85. Right posterior foot of Prothippus and Poebrotherium 310 



86. Manus of Artiodactyla 312 



87. Burrs on antlers of Cosoryx necatus Leidy . . . .316 



88. Diagram of excursion of lower jaw in mastication . 320 



89. Cervus, molars 321 



90. Cusps of superior premolars and molars 322 



91. Two true molars of both jaws of a ruminant . . . 323 



92. Sections of superior molar teeth 323 



93. Chirox plicatus Cope, palate and molar teeth . . . 324 



94. Meniscoessus conquistus Cope, last two superior mo- 



lars 325 



95. Lenmr collaris, dentition 326 



96. Esthonyx burmeisterii Cope, dentition 328 



