1907.] WORMS OF THE FAMILY EUDRILID^. 421 



The two sacs are not joined at their distal extremity. The 

 terminal apparatus of the male efferent ducts is quite like that 

 of P. ruivenzorii. In precisely the same way (text-fig. 123) the 

 sperniiditcal gland is almond-shaped, and somewhat bent upon 

 itself at the point whence its duct emerges ; the surface is not, 

 however, cj[uite so strongly furrowed. The copulatory chambers 

 seem to be exactly as in P. rthwenzoi^ii. 



Text-fio-. 123. 





C.C. 



Terminal male organs of Tolytoreutus grcuiti. 

 C.C. Copulatorj' chamber, p. Sijermidiical gland. 



The female organs of generation (text-fig. 1 24), on the other hand, 

 show greater differences fi'om the same organs in P. ruioenzorii. 

 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. Tliis break is very clear 

 in P. rtoioe7izorii. And in that species the diverticula * of the 

 spermathecal sac are 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 sperma- 

 thecal sac ; the greater part of the coiled tube, therefore, which 

 intervenes between the unpaired spermathecal sac and the re- 

 ceptaculum being referable to the diverticula of the spermathecal 

 sac. This important difference between these two species, other- 

 wise very nearly allied, is remarkable. It is apparently correlated 

 w^ith another structural feature in which they difler. In examining 



* The word " diverticulnm " is, of course, not strictlj' correct. The two spermathecae 

 are fused in the middle and separate at both ends. 



