PLATE VI 



EXPLANATION OF FIGURES 



46. A vesicle cut open along the mid-ventral line to show the relationship of 

 the embryos to each other and to the wall of the vesicle. Each of the four amniotic 

 partitions (a), which have been cut off close to the chorionic wall, lies just to the 

 left of the umbilical cord. These are attached to the wall near the tips of the 

 placental lobes at the f undus end. The left lateral placental disc is indistinctly 

 seen thiough the chorionic wall, and the notch separating it from the right 

 lateral disc is marked with the larger "n", while that indicating its division into 

 the two lobes is designated by the smaller "n," X |. 



47. A photograph of* vesicle no. 108, which contained five embryos. This 

 vesicle was cut open along the mid-ventral line. Embryos nos. I, II, and II, are 

 attached to the large, right lateral placental disc, and embryos III and IV to the 

 smaller, left lateral. (See text for a fuller description and significance.) X . 



