4 88 THE PHYSIOLOGY OF REPRODUCTION 



I'.cneath the epithelioid layer, in both areas the cells are drawn out 

 and pseudo-fibrous. The conditions for nutrition resemble those in 

 the very early human ovum, the trophoblast lying against a non- 

 vascular detritus-zone. But in the bat there is strong- evidence of 

 phagocytosis. The epiblastic protoplasm, where it is in contact with 



Cep 



VtlaU 



FKJ. 14(5. The placenta of the bat. (From Nolf's "Etude des modifications de 

 la mnqueuse uterine pendant la gestation chez le nmrin," Arc/,. </< /!>ol., 

 vol. xiv., 1896.) 



in., Muscularis ; </., unaltered niucosa ; (.'./>., epithelial layer; gl., glands; 



''./'/') paraplacental layer with blood-spacee (// : Art., artery running 



towards trophoblast ; IV., vein ; TV., trnphnldast with lacuna; ; !'//.//., 

 allantoic villi. 



dead tissue, is "crammed with irregular granules, some fatty and 

 others coloured brown with safranin " (Nolf). The mouths of the 

 glands opening at the non-embryonic pole are filled with debris, and 

 their epithelium is degenerated and desquamated. As previously 

 mentioned, no gland-ducts an- present in the i-nm-lir paraplacentaire. 

 The blind ends of the glands arc. however, distended with secretion, 

 and their epithelium is normal. 



N'ext a change occurs such as Hubrecht described in the hedgehog 

 (see p. 47H). The eiidotbelium of some of the vessels in the para- 



