HUBRECHT. eA 
av 
atr 
Fig. 129. Longitudinal section of a larva of Sipunculus nudus with its 
external Jarval layer 2/, which, later on, is shed; m mouth, a anus (after Hatschek, 
84). — Fig. 130. Longitudinal diagrammatic section of an embryo of Dasyurus 
(after Hill, 00). ad allantois, av area yasculosa on umbilical sac uv, atr region 
in which the trophoblast shows phagocytic properties. fra proamnion. — Fig. 131. 
Section through part of the »Deckschicht* (ds) with local proliferation of same 
in the frog. es ,,Grundschicht« (after Assheton, 96). — Fig. 132. Longitudinal 
diagrammatic section of the blastocyst of a Catarrhine monkey (Cercocebus cyno- 
molgus) with dorsal and ventral placenta (after Selenka, ’91). 
