190 RICHARD ASSHETON. 



wall, i. e. the obplacental folds. At this moment the location of the embryo 

 can only with difficulty be recognised from without. 



Fig. 3. — A diagram illustrating a longitudinal section of the blastodermic 

 vesicle and uterus of a rabbit about nine days after fertilisation. The epi- 

 blastic papilla and ectoplacental area are omitted. The cavity of the uterus 

 is seen to be obliterated by means of the horns of the vesicle {H.). 



Tig. 4. — A transverse section of the blastodermic vesicle about the time 

 that it becomes fiually located. 



Fig. 5. — Section of the lower pole of the blastodermic vesicle of a rabbit. 

 Seven days four hours, x 465. 



Fig. 6. — Section of the side of the blastodermic vesicle of about the same 

 age. X 465. 



Fig. 7. — Section of the lower pole of the blastodermic vesicle of a rabbit 

 (after attachment) and of the uterine epithelium. One of the wedge-shaped 

 papillae is seen to be piercing the epithelium, x 465. 



Fig. 8. — Section of the ectoplacental area of the blastodermic vesicle of 

 about the same age as that of which Fig. 5 is a section, x 465. 



Fig. 9. — Section of ectoplacental area later than Fig. 8. X 465. 



Fig. 10. — Section of ectoplacental area still later, x 465. 



Fig. 11. — Section of ectoplacental area about the time of its attachment 

 to the placental lobes. X 465. 



