232 Proceedin(js of the Royal Society of Victoria.. 



Figure E. 



About the 39tli annulus the epidi- 

 dymis of each side runs forward as a 

 straight tube opening into a somewhat 

 muscular sac which opens to the exterior 

 on the lower edge of the 26th annulus, 

 that is on the second annulus of segment 

 X. The female organs consist of a single 

 pair of ovaries (Fig. E. ov.) lying one on 

 either side of the nerve cord in the 30th 

 and 31st annuli. They are small rounded 

 bodies about the size of the testes and 

 well supplied with blood. From the 

 inner edge of each ovary opens a duct 

 — the right and left oviduct. The left 

 oviduct j^asses on the ventral side of the 

 nerve chain, and joins the right close to 

 the middle line. The single duct thus 

 formed is somewhat coiled with fairly thick walls. It opens in 

 the 37th annulus into the vagina. This organ (vag.) is large and 

 extends from the 37th to the 48th annulus; it is ovoid in shape, 

 broader at its anterior than at its posterior end. Its walls are 

 exceedngly thick and glandular. 



There is no appearance of an albumin gland, such as is found in 

 many other leeches, nor can I detect any particular portion of the 

 vagina wall specially modified to act as such. From the dorsal 

 surface at the iuiterior end opens the external reproductive duct. 

 This is slightly coiled. It passes to the right of the main duct, 

 underneath, that is on the ventral side of the right oviduct, 

 and opens on the lower edge of the 30th amiulus at the female 

 external reproductive opening. 



The reproductive organs are well supplied with blood. A 

 branch from the lateral vessel runs along the hair-like continuation 

 of the vas deferens to the epididymus, where it breaks up to supply 

 the walls. The capillaries join together and enter the ventral 

 sinus. Each pair of testes receives its supply from the lateral 

 vessel of its own side, and returns its Ijlood to tiie ventral sinus. 



Branches of the lateral vessel pass to the ovaries and a 

 somewhat large vessel runs along with the external reproductive 

 duct giving oft' small branches along its course and finally 

 breaking up in the wall of the vagina. 



