HUBRECHT. Pl. G. 
39 41 
ae kh 4 
,2hgh Bhd ad ge 
caagten Lavell i solhaertittettere tenets rdbtvedeestle 
Picchealstasdnntneed O52 O20 -“\ 
on Res e,0,09R, 285590 ‘ i) 
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@ Y BI8G RO OOO RR RET 
Fig. 39 and 40. Diagrammatic sections through two stages in the early 
blastocyst of man and the anthropomorphae, combined out of Selenka’s (99, 00) 
and Peters’ (99>) drawings. c connective stalk, som & spm somatic and splanchnic 
mesoblast. Amnion and trophoblast as in the hedgehog. — Fig. 41 and 42. A 
longitudinal and a transverse section of an early developmental stage of Galeo- 
pitheeus volans. In Fig. 41 the placenta is commencing to be formed on the 
upper surface of the blastocyst. Here too the amnion cavity (a) has arisen by 
dehiscence inside the embryonic knob. vm yentral mesoblast, connecting em- 
bryonic region with trophoblast. Fig. 42 belongs to a somewhat later stage in 
which a thickening in the entoderm (protochordal plate) has become visible. — 
Fig. 43. Transverse section through the ventral mesoblast of Galeopithecus. co 
coelom, ez entoderm, ¢r trophoblast. 
