PLATE V 



EXPLANATION OF FIGURES 



44. A vesicle split open to show the internal relationships of the different parts. 

 The amniotic connecting canals are seen to pass from the anterior ends of the amnia 

 to the spot occupied by the common amnion. This vesicle also shows a supernu- 

 merary canal (s.am.c.c.) extending from a small vesicle in the Trager wall to the 

 canal belonging to the lower, right-hand embryo. In the entire condition the vesi- 

 cle measured 24 mm. wide by 29 mm. long, (see fig. 3 for a diagram of the placenta.) 

 Very slightly enlarged. 



45. A vesicle laid open in a manner similar to the preceding. At the distal end 

 of each canal is shown a series of bead-like enlargements (c.e.). The origin of the 

 canal from the anterior tip of the amnion is shown with especial clearness in the 

 embryo lying nearest the foot of the plate. In the entire condition the vesicle 

 measured 24 mm. wide and 30 mm. long. Very slightly enlarged. 



