HUBRECHT. PUESC: 
(> 
be — Bh 
J 
) 
RS 
= % 
qe’ / 
Fig. 15. Section through a similar stage of Ammospermophilus. After 
a not yet published drawing of Prof. G. Lee of Minneapolis. Trophoblast ¢ 
continued oyer embryonic ectoderm cc, ex entoderm. — Fig. 16. The same for 
the sheep (after Assheton, “98). -— Fig. 17. The same for the pig (after Weysse, 
‘O4). The ectoderm has not yet opened out on the surface of the blastocyst 
(cf. Fig. 29-32). — Fig. 18. The same for Galeopithecus. — Fig. 19 and 20. 
The same for Tarsius. In Fig. 19 the entoderm ez is in the very earliest phase 
of delamination (after Hubrecht, 02). In Fig. 20 there are yet remnants of the 
trophoblastic covering of the ectodermie shield. — Fig. 21. The same for Tupaja 
(after Hubrecht, 95). — Fig. 22. The same for Pteropus. In the ectodermal 
knob (ec) a cayity will soon appear wich becomes the amnion cavity (after Selenka 
and Gihre, 92). vz umbilical vesicle. 
