p. R. A WATT 



263 



eight to nine on either side; each tubule is composed of three or more 

 cells. Each tubule ends in a cell full of nuclei which may give rise to 

 the egg-nucleus. This kind of ovary has 



(2) Oviducts (P^ig. 18). There are two oviducts, one on each side. 

 The ovarian tubules open into them, and they in their turn open into 

 the vagina as a single duct. The oviducts are coiled and nearly bent 

 upon themselves on their way to the vagina, with which they com- 

 municate ventrally after they have formed a common duct. 



(3) Vagina (Fig. 20). This is a single median muscular sac, com- 

 municating externally through the ovipositor. There are circular 

 muscles which seem to be very powerful. 



accessory 



gland 



Fig. 20. 



(4) Accessory glands (Fig. 20). They open into the distal part 

 of the vagina. They consist of two kinds, one larger than the other, 

 the smaller opening into the larger. At the entrance into the vagina 

 there are muscles which regulate the opening of these glands. 



(5) Spertnathecum (Fig. 18). There is a single median sperma- 

 thecum lying ventrally below the vagina, and the oviducts. It opens 

 into the distal part of the vagina by a duct which runs dorsal wards. 

 This spermathecum is used for storing the sperms. The vagina changes 

 in structure distally and opens into the tube formed by the ovipositors. 



Secondary characters. The ovipositors (Fig. 17). This structure is 



