CONTENTS. VU 



CHAPTER XXII. 

 TEGUMENTARY SYSTEM OP AVES. 



SECTION PA6B 



164. Compositiou of the Tegument 231 



165. Appendages of the Tegument 233 



166. Development of Feathers 236 



CHAPTER XXIII. 

 GENERATIVE SYSTEM OF AVES. 



167. Male organs and semination 242 



168. Female organs and ovulation 246 



169. Fecundation and structure of the laid egg . . . . . . 251 



170. Accessory generative structures and external sexual characters . . 256 



CHAPTER XXIV. 

 DEVELOPMENT OF AVES. 



171. Development and peculiarities of the Chick 259 



CHAPTER XXV. 

 CHARACTERS AND PRIMARY GROUPS OF THE CLASS MAMMALIA. 



172. Class characters 266 



173. Mammalian sub-classes 270 



174. Mammalian orders 274 



CHAPTER XXVI. 

 OSSEOUS SYSTEM OF MAMMALIA. 



175. General characters of the Skeleton 297 



176. General characters of the Skull 300 



177. General characters of the Limbs 305 



178. Special homologies of the skull-bones of Mammals .... 310 



179. Skeleton of Monotremata 314 



A. Vertebral Column 314 



B. Skull 318 



C. Bones of the Limbs 323 



180. Skeleton of Marsupialia 328 



A. Vertebral Column 328 



B. Skull 334 



C. Bones of the Limbs 350 



181. Skeleton of Rodentia 364 



A. Vertebral Column 364 



B. Skull . 367 



C. Bones of the Limbs . . . 378 



