XVI ILLUSTRATIONS. 



170. Pleurodont and acrodont dentition 332 



171. Head of Reptiles . 332 



172. Blind- worm (Anguis fragilis) ■-'3'* 



173. Feather of Bird . 336 



174. Wing of Bird 337 



175. Skeleton of Fowl . 338 



176. Skull of Fowl . 339 



177. Pectoral Arch of Fowl . 340 



178. Pelvis of Fowl (lateral view) 341 



179. Alimentary Canal of Fowl 342 



180. Ovary of Bird . 344 



181. Types of Birds' Skulls . 346 



182. Types of Birds' Skulls . 348 



183. Sternum of Fowl (front view) 350 



184. Split-Swimming Foot of Grebe (Podiceps fluviatilU) 354 



185. Foot of Raptorial Bird . 357 



186. Head of White-tailed Eagle {Halmetus albicUla) 360 



187. Skull of Duck ... 361 



188. Head of Grey Lag Goose and Foot of Domestic Goose 363 



189. Foot of Gallinaceous Bird 368 



190. Soolopacida3 378 



191. Head of Barn-Owl [Strix flammca) 384 



192. Head of Nightjar (Caprimulgus curopcuus) 387 



193. Soansorial Foot, as seen in Woodpeckers and Parrots 388 



194. Foot of Passerine Bird (Wagtail) 389 



195. Head of Finch 393 



196. Head of Shrike 402 



197. Ovum and Structure of a Fowl's Egg 408 



198. Section through part of Blastoderm (first day of incubation) 411 



199. Transverse Section of Blastoderm, incubated for eighteen hours 413 



200. Transverse Section through Posterior Pai't of the Head of an 



Embryo Chick of Thirty Hours 416 



201. Head of Embryo Chick of the Fourth Day 419 



202. Ovum of Rabbit . 427 



203. Diagram of Foatal Membranes of a Jlammal 429 



204. Vertical Section of Injected Placenta of a Mare 430 



205. Diagrammatic Section of Pregnant Human Uterus with con- 



tained Fcetus 432 



