PRAjSIK e. beddaed— veemes. 31 



their distal extremity. The terminal apparatus of the male efferent ducts is quite like 

 that of P. ruwenzorii. In precisely the same way (text-fig. 4) the spermiducal gland 

 is almond-shaped, and somewhat bent upon itself at the point whence its duct emerges ; 

 the surface is not, however, quite so strongly furrowed. The copulatory chambers seem 

 to be exactly as in P. ruwenzorii. 



The female organs of generation (text-fig. 5, p. 32), on the other hand, show greater 

 differences from the same organs in P. rimenzorii. There is the same slender median 

 spermathecal sac which underlies the nerve-cord and is hardly convoluted in its course. 

 Nor is it of any greater diameter than the nerve-cord. Anteriorly this sac divides into 

 two, but there is no marked division near to the point of bifurcation of the sac between 

 the spermathecal sac and the oviduct which opens into it. This break is very clear 

 in P. ruivenzorii. And in that species the diverticula * of the spermathecal sac are 



Text-fls. 4. 



i 



Terminal male organs of Polytoreutus granti. 

 c.c. Copulatory chamber, j^- Spermiducal gland. 



short, the greater part of the coiled tube intervening between the unpaired spermathecal 

 sac and the receptaculum being the oviduct. In the present species I could not 

 ascertain the precise spot where the oviduct debouched into the diverticula of the 

 spermathecal sac, but this point is at any rate very far removed from the point of 

 bifurcation of the spermathecal sac ; the greater part of the coiled tube, therefore, 

 which intervenes between the unpaired spermathecal sac and the receptaculum being 

 referable to the diverticula of the spermathecal sac. This important difference 

 between these two species, otherwise very nearly allied, is remarkable. It is apparently 

 correlated with another structural feature in which they differ. In examining micro- 

 scopically this part of the reproductive apparatus in glycerine after removal from the 

 body, I noted in addition to the receptaculum, called by Michaelsen the '•' Eitrichter- 

 blase," a spherical chamber which obviously corresponds to what Michaelsen calls the 



* The word " diverticulum " is, of course, not strictly correct. The two spermathecte are fused in the 

 middle and separate at both ends. 



