HUBRECHT. Pt 0. 
Fig. 71 to 73. Three figures of sections through the blastocyst of the 
frugiverous bat Pteropus (after Selenka, Géhre, ‘92). In fig. 71 the embryonic 
ectoderm is yet a solid cellmass, in fig. 72 an amnion cavity (a) has appeared 
within it, in fig. 73 the final relations between trophoblast /¢/, amnion a, embryo 
and umbilical vesicle (wv) are established. — Fig. 74. Transverse section 
through amnion a, embryo and umbilical vesicle wz of Hylobates (after Selenka, 
00}. sp the splanchnic mesoblast on the umbilical vesicle (27) which carries 
a very dense net of thickened venae in which haematopoietic processes occur. 
— Fig. 75. Surface view of the amnion-fold of Chamaeleo. — Fig. 76. The 
same in transverse section, with proliferation of the anterior entoderm (4). ¢ 
trophoblast separated into two layers. — Fig. 77. Transverse section of an 
embryo of Sphenodon with amnion nearly closed. The trophoblast is double 
layered. Fig. 75 to 77 after Schauinsland, ‘03. 
