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Show 49. Cetiosaurus leedsi.-Right femur, posterior aspect; upper end, transverse sections of shaft, and lower end............................. 242 50. Young female Giraffe from Nigeria............................................ 245 51. Head of Giraffe from Nigeria .................................................... 247 52. Porocephalus herpetodryados .................................... .. .......... 251 53. First premolar of the maxillary of Lepus europceus, of L. timidus, and of hybrid between both .................................................... 282 54. Anterior part of the zygomatic arch of Lepus europceus, of L. timidus, and of hybrid between b o th ................................ 283 55. Dermochelys coriacea, muscles of the neck ................................ 293 56. Dermochelys coriacea, anterior part of the vestigial muscles of the back .............................................................................. 296 57. Dermochelys coriacea, inner surface of the plastron ................. 298 58. Dermochelys coriacea, muscles of the right shoulder, ventral aspect ...................................................................................... 299 59. Dermochelys coriacea, left shoulder-girdle, anterior view ......... 300 60. Dermochelys coriacea, right slioulder-girdle, dorsal view .......... 302 61. Dermochelys coriacea, left shoulder-girdle, ventral view .......... 302 62. Dermochelys coriacea, light fore limb, extensor surface............. 303 63. Dermochelys coriacea, muscle-attachments upon the extensor surface of the forearm and hand ............................................ 305 64. Dermochelys coriacea, right fore limb, tlexor surface ................. 306 65. Dermochelys coriacea, left hind limb, ventral aspect ................. 308 66. Dermochelys coriacea, muscle-attachments to the left hind limb ......................................................................................... 310 67. Dermochelys coriacea, muscle-attachments to the dorsal surface of the left hind limb ............................................................... 311 68. Dermochelys coriacea, lids of the left eye seen from within . . .. 314 69. Dermochelys coriacea, oesophagus.-A. Bifid process from the middle part. B. Trifid process from the lower end............. 315 70. Dermochelys coriacea, abdominal viscera seen from the ventral aspect ..................................................................................... 316 71. Dermochelys coriacea, diagrammatic transverse section through the mid-region of the peritoneal sac........................................ 317 72. Dermochelys coriacea, left kidney with its associated veins and arteries .............................................................................. 321 73. Dermochelys coriacea, part of wall of uro-genital sinus, with termination of oviduct and ureter (right side) ..................... 323 x x i Page Pitoc. Z oo l. Soc.- 1905, V o l . I. c |