DESCRIPTION OF PLATE F. 



Certainly the single egg which commences the series 

 is a much larger body ; it is always impregnated, and 

 therefore should be considered to be the true ovum, as 

 in other cases ; ?/, granulated vitellus ; m, vitelline 

 membrane ; c, investing coat, answering to the chorion ; 

 o, eye rudiment. 112 diam. 



Fig. 12. — Clasping armature and hooks of the winged 

 female of Myzus persicce. The cauda, a, anus, entrance 

 to vagina, and genital armature, r, are here visible. 



Fig. 13. — Bundles of muscular fibres forming part 

 of the inner walls of the oviduct. They have been 

 torn asunder to show the structure. 



