xx LIST OF ILLUSTRATIONS 



FIG. PAGK 



1225. Homo, sagittal section of ovary . . 568 



1 226. Development of Graafian follicle 568 



1227. Segmentation of Mammalian oosperm . 570 



1228. Lepus cuniculus, embryonic area. . 571 

 1220. ,, ,, embryos . . 572 



1230. Formation of foetal membranes of Mammal . . . 573 



1231. Lepus cuniculus, embryo with membranes . 574 



1232. Erinaceus, formation of amnioii and trophoblast . . 575 



1233. Formation of amnioii in Mammalia .... . 575 



1234. Macropus, mammary foetus .... . . 577 



1235. Hypsiprymnus rufescens, embryo and foetal membrane . . . 578 



1236. Phascolarctos cinereus ,, ,, ,, ,, . 578 



1237. Perameles obesula placenta . 578 



1238. Theria and Monotremata, blastula . . 579 



1239. Phascolotherium bucklandi, mandible . . 582 



1240. Plagiaulax becklesi, mandible . . 582 



1241. Diprotodon australis, skeleton 583 



1242. Nototherium mitchelli, skull ... . . . 584 



1243. Thylacoleo carnifex, skull . . 584 



1244. Glyptodon clavipes. skeleton 585 



1245. Mylodon robustus . . 585 



1246. Squaloclon, teeth . .586 



1247. Dinotherium giganteum, skull 587 



1248. Tillotherium fodiens, skull 589 



1249. Diagram illustrating the mutual relationships of the Chordata . 596 



1250. ,, ,, Phyla of 



animals 598 



1251. Map showing depths of sea between the British Isles and the 



Continent 603 



1252. Map showing depths of sea between New Zealand and Australia . 604 



1253. Diagram showing the relations of the Zoo-geographical Regions . 614 



