74 



The Form of Insects 





tube, a number of nuclei can be seen, but the pro- 

 toplasm is not definitely divided into cells. In the 

 lower, wide region, the large egg - cells can be 



r ec ognised. 



and as the 

 oviduct is 

 a p proached, 

 these become 

 arranged in a 

 single row, 

 each being 

 surrounded by 

 a layer of 

 nuclei forming 

 a follicle (fig. 

 50). By the 

 action of these 

 nuclei the two 

 coatings of 

 the egg are 

 for me d — a 

 thin inner 

 membrane 

 (vitelline mem- 

 brane) s u r- 

 rounding the 

 yolk and a 



Fig. si- — ^- Hind-body of Queen Honey-bee ; O. O. . 



ovaries; od. oviducts containing egg (E) ; co.d. ChltmOUS layer 



vagina; j. spermalheca ; /.^.poison-gland;/^. / /^ ; \ Xhp 



poison-bag; st. sting; /. "feelers' of sting. B. \lijuti lun ). 1 IJC 



Rudimentary ovaries of "worker.'; C. Partly Jatter at OUC 

 developed ovaries of lertue worker. from tsen- 



ton (after Cheshire) Bull, i (n.s.) Div. Ent. U.S. end IS per- 



^^P^-^^""- forated with 



numerous fine pores (micropyles), through which sperm- 

 cells have an opportunity of penetrating to the egg. 



In many insects the arrangement of cells within 



