PLATE IV. 



Fig. XLII. Transverse section of early Mantis embryo (E) with amniotic 

 folds (AM) on each side 



Fig. XLIII. Transverse section of more advanced Mantis embryo almost sepa- 

 rated from surface by union of amuiotic folds. 



XLIV. Transverse section of still older Mantis embryo showing origin of 

 inner layer (I). 



Fig. XLY. Transverse section of early stage of segmentation of grasshopper 

 egg, showing a few cells (YC) in yolk. 



Fig. XLVI. Transverse section of a later stage of grasshopper egg showing 

 yolk pyramids with cells at their bases. 



Fig. XLYII. Transverse section of head of advanced grasshopper embryo 

 showing commissure (Cj of supra-cesophageal ganglion. 



Fig. XLVIII Succeeding section of same series showing antennae (ANT) and 

 labrum (LB). 



Fig. LXIX. Transverse section through commencing cesophageal ingrowth. 



Figs. L-LXI1. Succeeding transverse sections of same embryo. 



Figs. LII-LVIII. Sections through the rnandibular region. 



