418 



H. H. Newman and J. T. Patterson. 



am.ac. 



p.am. 



15 



FiG. 15. A detailed drawing of embryo I (fig. 14) as seen from the dorsal side. A 

 photograph of this embryo is shown in fig. 31. al., allantois; am. c.c, connecting 

 canal of amnion; b.b., belly-stalk band, note that the band is much more distinct 

 on the left side than on the right; p.s., primitive streak; s.v., scale-like villi; tr., 

 Trager region, which shows the villi as seen from their under sides. For a fuller 

 description see text. X 21. 



