32 



ZOOLOGICAL EESTJLTS OF THE EUWENZOEI EXPEDITION. 



" Ovarialblase," and which is believed by him to contain the ovary. In Polytoreutus 

 cmruleus * this Ovarialblase forms the end of the branch of the spermathecal sac into 

 which it opens on the one hand, and is connected on the other with a narrow tube 

 communicating with the Eitrichterblase, which is, I think, part of the funnel of the 

 oviduct pulled out by the retreating spermathecal sac. I cannot be certain that the 

 spherical chamber in Polytoreutus granti has the same connections, but I cannot help 

 regarding it as the homologous structure. I have not represented it in the figure 

 (text-fig. 5). Now this appears to be wanting in Polytoreiotus ruwenzorii altogether, as 

 it is, for example, in Polytoreutus magilensis. Where it does occur it appears to mark 

 the boundary between the oviduct and the spermathecal sac ; if so, then the present 

 species has, as I have already suggested, a very long diverticulum to the spermathecal 

 sac and a short oviduct f . 



Text-fiff, 5. 



Siiermatbecal sac of Polytoreutus granti. 

 Lettering as in text-Ssr. 3. 



Polytoreutus granti difi'ers from its ally P. rmvenzorii in possessing, like P. kirima- 

 ensis and P. sylvestris, considerable appendages to the spermathecal sac posteriorly. 

 These measured in my example 6 mm., and were therefore just a trifle shorter than 

 the spermiducal glands, which measure 7 mm. in length. The proportions, in fact, 

 are not very difi"erent from those of P. sylvestris ; but in the present species the length 

 of both structures seems to be considerably less than in P. sylvestriSfWhere they extend 

 very much further back in the body. As in that species, however, the spermathecal 

 diverticulum on each side receives or emits the duct leading to the exterior from the 

 side and not from the end. The relationships* of the diverticulum to the thread-like 

 regions of the spermathecal sac which enter and leave it were precisely like those 



* Michaelsen, JB. Hamb. wiss. Anst. ix. Taf. iv. fig. 30. 



t Beddard, Quart. Journ. Micr. Sci. n. s. vol. xxxiv. pi. xxv. fig. 7. 



