136 



INVERTEBRATA 



CHAP. 



cell 2b22ii, and an inner and lower cell 2b22i2 whilst 2b222 divides into 

 two sisters lying side by side, viz. 2b^22' and 2b222'. Now these four 

 cells in quadrant B, and the two cells in quadrant A, viz. 2a?'^'^'' and 



B 5&' 



5b' 



?h]P2>V° 2,b;°,, 2bf' Q-L222 



Fig. 103. — (Ountinued on opposite page.) 



2a222=', and in quadrant C, viz. 2c22ia and 2c222=i (Fig. 103, C), are destined 

 to form the stomodaeum, but for the complete history of this 

 structiire we must wait until we have considered the history of the 

 third quartette of micromeres. 



