Of the remaining genera which are usually grouped together into a second sub-family, five, viz. _Malodrilus_, _Kaffania_, _Gardullaria_, _Teleudrilus_ and _Teleutoreutus_, are confined to tropical North East Africa. _Eminoscolex_ occurs in the same district but also to the south in the great lake region. The most remarkable fact about this genus is that one species _E. steindachneri_ comes from the Cameroons, and another _E. congicus_ from the Congo, and thus the range of the genus is right across the continent. _Neumanniella_ has much the same range. _Polytoreutus_ is a purely equatorial East and Central genus, reaching from the coast to the lakes. _Bettonia_ known by three species is from British East Africa. The remaining genera, viz. _Hyperiodrilus_, _Heliodrilus_, _Alvania_, _Iridodrilus_, _Rosadrilus_, _Euscolex_, _Parascolex_, _Preussiella_, _Buttneriodrilus_, _Beddardiella_, _Metascolex_, are all West African and the vast majority equatorial. We thus see that with one exception the genera of East Africa are totally different from those of West Africa and that the family as a whole is restricted in its range to a comparatively small part of the vast African continent. It also obviously follows, and it is advisable to state this fact however obvious, that no species are common to the two sides of the continent except indeed the ubiquitous _Eudrilus_, whose range over the world has been more than once referred to in this book. On the other hand the genus _Dichogaster_ offers quite different facts, which are in contradiction to those just enumerated. This genus as already said is very characteristic of tropical Africa, and a large preponderance of the known species are confined to that continent. Although there is some variation in structural characters among the many species which compose this genus, there is but little doubt that they are all rightly referred to one genus with perhaps some doubtful, though not very striking, exceptions. In any case the utmost divergence of structure between worms usually placed together in this genus is nowhere near to that which separates the genera of Eudrilidae from each other. Of the African members of the genus the species are pretty evenly divided between the eastern and western halves of the continent; they are, like the Eudrilidae, tropical in range, not occurring to the southward, where their place is taken by the Acanthodrilinae and Geoscolecidae. There are it is true a few species, such as _D. gracilis_ and _D. bolavi_, which are common to the two sides of Africa; but in these cases we clearly have to do with those rather mysterious species which can apparently unduly extend their range and which are known as peregrine forms; for they also occur in other parts of the world besides Africa. We have therefore in _Dichogaster_ the case of a genus which ranges all over the tropical parts of Africa, but whose species are not common to the Atlantic and Indian shores of that continent.