IO 6 LEWIS R. GARY. 



PLATE III. 



FIGS. 13 and 14 are part of the series described in the last paragraph. They 

 complete the series which began with Fig. 10. 



FIGS. 15, 16, 17 and 18. A series of sections, at different levels, through an older 

 embryo in which all of the twelve primary mesenteries have reached the stomodeum. 



