viii] MOVEMENT AND MIGRATION 115 



coast. Pareudrilus reaches still further north while 

 Nemertodr litis is limited to the Mosambique region 

 and to the Orange River district further south. The 

 only remaining genus of this sub-family of the 

 Eudrilidae is Libyodrllus which is purely West 

 African and equatorial. 



Of the remaining genera which are usually grouped 

 together into a second sub-family, five, viz. Mcdo- 

 drilus, Kaffania, Gardidlaria, Teleudrilus and 

 Teleutoreiitus, 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. steindacTmeri comes from the Cameroons, and 

 another E. congicus from the Congo, and thus the 

 range of the genus is right across the continent. 

 Neumamuella has much the same range. Polt/- 

 toreutus 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. Hypcriodrilus, Helio- 

 drihis, Alvania, Iridodrdus, Rosadrilus, Etiscolex, 

 Parascolex, Preussiella, Biittneriodrilns, Beddard- 

 iella, 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 



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