HUBRECHT. Pl. D. 
tr 
tr 
en 
en 
Fig. 23. The same for the rabbit (after 
Kélliker “S2). The trophoblastic peripheral wall of 
the blastocyst continues into the Rauber’s cells zr 
above the ectoderm. — Fig. 24 and 25. The same 
for Cavia (after Selenka). The reduction of the 
trophoblast is yet far more considerable. @ amnion cavity. — lig. 26 and 27. 
Sections through two early stages of the mouse’s blastocyst (after Selenka, °S3). 
The trophoblast fev) is much further reduced in the second than in the first 
whereas that part of it (AZ) which will form the placenta has proliferated much 
more considerably. @ amnion cavity. 
