LIS T OF ILL USTRA TIONS. xv 



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 



G7. Elbow of horse • . . 281 



68. Periptydms iLiabdodon Cope, showing foot .... 288 



69. Hind foot of Poebrotherium labiatuni 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 elaphns 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. Khinocerus unicornis carpus 300 



81. Equus caballus iove iooi 300 



82. Gazella dorcas 301 



83. Pes of Merychocharus viontanus 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 Cfjisrjx «d'(-rt/«^j' 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. C///;vjr/i/;Va/«j- Cope, palate and molar teeth . . 324 



94. Aleniscot'ssus conquistus Cope, last two superior mo- 



lars 325 



95. Lemur collaris, dentition 326 



96. Ksthonyx burmeisterii Cope, dentition 328 



