XVI 



ILLUSTEATIONS. 



170. Pleurodont and acrodont dentition 



171. Head of Reptiles .... 



172. Blind-worm {Anguia fragilis) 



173. Feather of Bird ..... 



174. Wing of Bird ..... 



175. Skeleton of Fowl .... 



176. Skull of Fowl ..... 



177. Pectoral Arch of Fowl .... 



178. Pelvis of Fowl (lateral view) 



179. Alimentary Canal of Fowl 



180. Ovary of Bird ..... 



181. Types of Birds' Skulls .... 



182. Types of Birds' Skulls .... 



183. Sternum of Fowl (front view) . 



184. Split-Swimming Foot of Grebe (Podiceps fluviatilis) 



185. Foot of Raptorial Bird .... 



186. Head of White-tailed Eagle {Saliaetus albicUla) 



187. Skull of Duck 



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



189. Foot of Gallinaceous Bird 



190. Scolopaoidae ..... 



191. Head of Barn-Owl (Strix fia/mmea) 



192. Head of Nightjar (Ca/prmvulgus ev/ropceus) 



193. Scansorial Foot, as seen in Woodpeckers and Parrots 



194. Foot of Passerine Bird (Wagtail) 



195. Head of Finch ... 



196. Head of Shrike ..... 



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



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



199. Transverse Section of Blastoderm, incubated for eighteen hours 



200. Transverse Section through Posterior Part of the Head of an 



Embryo Chick of Thirty Hours 



201. Head of Embryo Chick of the Fourth Day 



202. Ovum of Babbit . .... 



203. Diagram of Foetal Membranes of a Mammal 



204. Vertical Section of Injected Placenta of a Mare 



205. Diagrammatic Section of Pregnant Human Uterus with con- 



tained Foetus ... . . 



432 



