TABLE OF CONTENTS. 



PART II. THE HISTORY OF THE MAMMA- 

 LIAN EMBRYO. 



Inikoduotion, pp. 307, 308. 



CHAPTER X. 



Genebal Development oe the Embkto . . pp. 309 — 341. 



The ovarian ovran, 309, 310. The egg-membranes, 310. Ma- 

 turation and impregnation, 310 — 312. Segmentation, 313 — 314. The 

 blastodermic vesicle, 314 — 316. The formation of the layers, 316 — 

 320. The primitive streak and groove, 319, 320. The medullary 

 groove, 330, 321. The mesoblast, 321 — 325. The notochord, 325, 326. 

 The rudiment of the neurenteric canal, 326. Eecapitulation, 326. 

 The vascular area, 326. General growth of the embryo, 327 — 334. 

 The human embryo, 335 — 341. Embryos of guinea-pig, etc. with so- 

 called inversion of the layers, 341 . 



CHAPTER XI. 



Embbtonic Membeaseb and Yolk-Sac . . . pp. 342 — 364. 



The typical development of the embryonic membranes, 342 — 352. 

 Vascular area of rabbit, 343 — 346. The yolk-sac or umbilical vesicle; 

 amnion, 343. The subzonal membrane, 346. Attachment of blasto- 

 dermic vesicle to uterine waJls, 347. The formation of the chorion, 

 348. Mesoblast and blood-supply of the allantois, 348, 349. The 

 placenta, 349, 350. The fate of the embryonic membranes, 350 — 352. 

 Deoiduate and non-deoiduate type of placenta, 352. Comparative 

 history of the mammalian fatal membranes, 352 — 359. Ecetal mem- 

 branes of Monotremata and Marsupialia, 352. The disooidal pla- 

 centa, 353, 354. The metadiscoidal placenta, 354 — 358. The zonary 

 placenta, 358, 359. The diffuse and polycotyledonary placenta, 359. 

 Comparative histology of the placenta, 359 — 363. Evolution of the 

 placenta, 364. 



