ILLUSTRATIONS xv 



FIG.* PAGE 



97. Experimentally produced placenta of pseudo-pregnant rabbit 375 



98. Part of an early human chorionic villus - 397 



99. Early blastocyst of rabbit 405 



100. Formation of the amnion in the rabbit 413 



101. Foetal membranes of horse - - 413 



102. Diagram to illustrate the three parts of the wall of the yolk-sac (rabbit) 416 



103. Diagram of an opossum embryo and its appendages - 417 



104. Diagram showing the arrangement of fcetal membranes in Dasyurus 418 



105. Diagram showing the arrangement of fcetal membranes in Peramden 419 



106. Elongated blastocyst of sheep at thirteenth day of pregnancy 420 



107. Transverse section through blastocyst of sheep at twenty-flfth day 42l' 



108. Blastodermic vesicle of rabbit 422 



109. Diagram of blastodermic vesicle of rabbit in longitudinal section - 423 



110. Diagram to illustrate foetal membranes of Mrindceus 425 

 111.. Hypothetical section of human ovum embedded in decidua 426 



112. Portion of injected chorion of pig - 427 



113. Section through wall of uterus and blastocyst of pig at twentieth day 



of pregnancy - - 428 



114. Diagram representing a stage in the formation of the placenta (pig) 429 



115. Section through uterine and embryonic parts of a cotyledon of sheep 



at twentieth day of pregnancy - - - 430 



116. Section through base of foetal villus, etc. (sheep) 431 



117. Columnar trophoblast-cells from the base of foetal villus at third month 



of pregnancy (cow) to show phagocytosis 433 



118. Histology of the placenta in the cow and sheep - 435 



119. First stage of cellular secretion in placenta of cow 4.37 



120. Ingestion and disintegration of red blood corpuscles by trophoblast of 



sheep 439 



121. Absorption of "Stabohen" by trophoblast of sheep 441 



122. The uterine mucosa of dog at about twenty-third day of pregnancy 443 



123. Ovum with zonary band of villi 445 



124. The angioplasmode of dog at thirtieth day of pregnancy 446 



125. The labyrinth and green border of placenta of dog at fortieth day ofi 



pregnancy - - 447 



126. Transverse section of a four days' gestation sac of rabbit 451 



127. Transverse section of a seven days' gestation sao of rabbit 452 



128. Section through uterine mucosa of rabbit pregnant about eighteen days - 453 



129. Thickened ectoderm in rabbit, attached to placental lobe - - 454 



130. Iron granules in placenta of rabbit at eighteenth day of pregnancy 459 



131. Glycogenic areas of rabbit's placenta at twelfth day of pregnancy 461 



132. Inversion of germinal layers in blastodermic vesicle of mouse 468 



133. Longitudinal section of implantation cavity of field-mouse about eighth 



day of pregnancy 469 



134. Longitudinal section of uterus and implantation cavity of guinea-pig 472 



135. Blastodermic vesicle of guinea-pig, showing inversion of germinal layers 473 



136. Implantation cavity of guinea-pig - 474 



137. Implantation cavity of guinea-pig 475 



138. AUantoidean diplo-trophoblast of Erinaceiis 477 



139. Section in situ df ovum of Erinaceus 478 



140. The extension of yolk-sac against lacunar trophoblast in Erinaceus 479 



141. Transverse section through uterus of Sorex at a stage when the blasto- 



cysts are still in the oviducts 480 



142. Part of the anti-mesometrial wall of the uterus of Sorex 482 



143. Uterus and embryo of Sorex 483 



144. Orifice of uterine gland of mole with trophoblastic dome 485 



145. Replacement of oraphaloidean by allantoidean placenta 486 



146. Placenta of bat 488 



