AND THE FOF.TAL MEMBTIANES, TX THE THTOK. 



:;')9 



B 



wliy this is in two nreas FDE niid ECMDE is that tlic 

 iiiterallnntoic scptnm Iims heeji ioklcd in two ülonn' the :ixis E D. 



A reference to Di;ig. il will 

 °' ' lielp to make this as well 



as some other points clear. 

 Lettering- in the diao-ram 

 is as far as possible the 

 snme ;is in Figs. 15 and 1 7. 

 Tu A. the rod F E, vvhidi 

 represents the allantoic vein 

 in its passage from the in- 

 ner to the onter limh, is 

 enfolded l)y a piece of |>a]ier 

 so that it stands at the head 

 of a deep fissnre or incision 

 (MEFÜ). FF FM S re- 

 presents the anterior allan- 

 toic limb, ÜFEMT the 

 E posterior lind), and E M V F 

 the interallantoic septnm. 

 in W, the area E M ü F is 

 folded along the line K D 

 so that it a])pears now as 

 1 w<^ areas, FDE and E M U D E. The triangidar area E D K is two 

 layered, and the corresponding area in Figs. 17 and 1<S is painted 

 blacls. Tlie line EM corresponds to tlie line ECM in Fig. 15 and 

 E C Fl in Fig. 1 7. The line F D Ü corres])onds to the line FDM in 

 Fig. 15 and FDG in Fig. 17. 1 ho|)e 1 have now made clear the 

 disturbances cansed by the allantoic vein and the ndafioiis of the 

 interallantoic se])t iim. 



