PLATE LXVIII 
Embryology of Aphis pomi; 
Fig. i.—Fertilized egg previous to formation of blastoderm. 
Fig. 2.—Fertilized egg showing formation of blastoderm. 
Fig. 3.—Unfertilized egg. 
Fig. 4.—Polar organ. 
Fig. k .—Condition of embryo and polar organ at commencement of revolution. 
Fig. 6.—Yolk cell. 
Fig. 7.—Germ cell. 
