Plate IV. 



p^f'l 



^f^^fF Fi^.5 



p.o~'> 5 , ^ 



Development of the Embryo in the Egg of Toxoptera Graminum. 

 t ig. l.-Longitudinal section representing the somewhat cone-shaped germ baud ready to f^^J^^J^ffiSJ, the 



diameters. Fig. ^.-Sagittal section showing the germ band folding a 1 d.fle.enti n i ,.. gana|er n g^ 



The ovarian yolk has taken a more anterior position. Ihe "polai oigan is vacuoiatea now . «•[ 



(Original.) 



