XXI 



Tage 



55. Ceratod'us forsteri in various positions at the time of its coming 



to the surface to breathe 177 



56. A ventral scale of Chnjsopelea oniata Shaw 228 



57. Diag-rammatic transverse sections of the bodv of Chrysopelca 



ornata 229 



68. Skull of Ursus arctos shanorum, lateral view 231 



59. a, skull, and b, last lower molar of Ursus avctos shanorum .... 232 



60. Front and side views of skull of Cercointhecus patas bearing 



supernumerary premolars 233 



61. Lepidosis of the front of the left forearm of Cnemidophorus 



mexicanus 280 



62. Lepidosis of the under surface of the left forearm of Cnemido- 



j}horus iimmitahilis, &c 281 



63. Lepidosis of the under surface of the forearm of Cnemidophorus 



mexicanus 282 



64. Lepidosis of the collar and throat of Cnemidophorus tessellatus, 



&c 283 



65. Lepidosis of the collar and throat of Cnemidopltoriis imviutabitis, 



&c 284 



6G. Evolution of Pattern of Cnemidophorus deppei, from G to 11 pale 



stripes 290 



67. Evolution of Pattern of Cnemidophorus imniutubilis A to E, and 



of C. guttatus from youth F to old age I 291 



68. Evolution of Pattern of Cnemidophorus scalaris from youth to 



adult 291 



69. Evolution of Pattern of Cnemidophorus communis from A to D 



and of C. mexicanus from A to D' 292 



70. Evolution of Pattern of Cnemidophorus tessellatus A to D and of 



C. rubidus E 293 



71. Cnemidophorus sexlineatus and C. deppei 303 



72. Cnemidophorus deppei 311 



73. Cnemidophorus sexlineatus and C. deppei 315 



74. Cnemidophorus immutahilis 323 



75. Cnemidophorus immutabilis and C. yidtatus 324 



76. Cnemidophorus scalaris 336 



77. Cnemidophorus communis occidentalis 344 



78. Cnemidophorus communis 347 



79. Cnemidophorus communis occidentalis and C. c. australis 353 



80. Cnemidophorus bocourti from Oaxaca 357 



81. Cnemidophorus mexicanus typicus, C. m. balsas, and C. immuta- 



bilis 359 



82. Cnemidophorus mexicanus typicus 361 



83. Cnemidophorus mexicanus var. balsas 304 



84. Portion of ventral surface of Trachysaurus ruyosus 376 



85. Similar ia funyoides, sp. n. 417 



Pfioc. ZooL. Soc. — 1906, Vol I. 



