XXIV 



Page 



23. Wing--structure of Chionis alba 156 



24. Diagram of intestinal pattern of Rhynchcea capensis 157 



25. Diagram of intestinal pattern of Hydrophasianus chirurgus .... 158 



26. Shoulder-muscles of G^dicnemus scoIojmx 159 



27. Biceps of Chionis alba 361 



28. Thigh-muscles of Chionis alba 166 



29. Map of Mexico 193 



30. Diagram of the distribution of 250 Mexican species according to 



Altitude 229 



31. Diasrams to ihustrate the contours of Mexico at diflferent geo- 



logical ages 235 



32. Diagrams to illustrate the contours of Mexico at different geo- 



logical ages 236 



33. Liver of Gerrhosaurusjiavigularis, ventral aspect 259 



34. Liver of a second example of Gerrhosaurus Jiavigularis, ventral 



aspect 259 



35. Gastro-hepatic ligament of Oerrhosaunis Jiavigularis, showing- 



course of muscular bundle 261 



36. P&ncre&s o£ Lacei'ta ocellata Sind oi Gerrhosaurus Jiavigularis .. 262 



37. Aortic arches and first part of dorsal aorta of Gerrhosaurus 



Jlavigidaris , 263 



38. Abdominal region of aorta of Gerrhosaurus Jiavigularis 264 



39. Lateral view of brain of Varanus exanthematicus and of Ttqyi- 



namhis nigropunctatus 268 



40. Dorsal view of brain of Varanus exanthematicus 268 



41. The foetus of Acomys cahirinus 281 



42. The placenta of Acomys 282 



43. A section of a portion of the placenta of Acomys 283 



44. A section through the junction between trophoblast and tropho- 



spongia of Acomys 284 



45. A. diagram of a section through the centre of the placenta of 



Acomys 285 



46. Supposed clavicula of Diplodocus 290 



47. Same bone of Diplodocus 290 



48. Diagram of penis of Struthio 291 



49. Os penis of European Otter 292 



50. The Satyrus indicus of Tulpius 299 



51. Early figure of Chimpanzee, from Astley's ' Travels ' 301 



52. A, lateral, and B, upper view of the skull of Vulpes ferrilatus . . 304 



53. A, upper, and B, lower right molar series of Microtus walto?ii . . 307 



54. The Black Guereza (Colobus satanas) 325 



55. The Mantled Guereza ( Colobus palliatus) 326 



56. Sharpe's Guereza {Colobus sharpei) 327 



57. The White-tailed Guereza (Colobus caudatus) .' 327 



58. The White-thighed Guereza {Colobus vellerosus) 328 



59. Principal arteries of Ilatteria 463 



60. Anterior abdominal and portal veios of Hatteria 465 



61. Heart and aortic trunks of Ophisaurus, to illustrate mode of 



oriiiin of carotid 469 



