HUBRECHT. Pt.-CG 
139 140 
Fig. 138 and 139. Two sections through two successive phases of placen- 
tation of Perameles. a@dZ allantoic vessels, ¢ trophoblast, ¢s maternal tropho- 
spongia (after Hill, °97). — Fig. 140. Section through the placenta of the bat 
(after Nolf, ’96). ¢s maternal trophospongia. @ embryonic trophoblast, yet 
including remains of the endothelia of maternal capillaria which in other 
places have disappeared by resorption. av allantoic vessels with embryonie 
bloodcorpuscles. 
