OCR Text |
Show was collected by Mr. Stuart Betton, at Lagari, British Central Africa. The prostomium is continued by grooves over about half of the buccal segment. The setae are wider apart in the case of the ventral couples than in the case of the lateral. The limits of the clitellum are a little obscure; it appears to embrace segments xiv.-xvii. inclusive. The chief, indeed practically the only, reason which leads me to separate this Eudrilid generically, is the condition of the reproductive apertures. The rule in the family is that the apertures of the sperm-duct and of the spermathecae are unpaired and median in position. Text-fig. 36. 214 MR. F. E. BEDDARD ON [Mar. 3, Ventral surface of Bettonia lagariensis. spermathecal pores; £ , male pore. There are, however, a few exceptions, such as Eudrilus itself, and an apparently close ally of the present genus, viz. Eminoscolex. Bettonia offers a third arrangement of the reproductive pores. |