76 EARTHWORMS AND THEIR ALLIES [CH. 



Euscolex, Metascolex, BeddardieUa,Gm'duUa7'iawith. 

 only one species to each genus, Bettonia with three 

 species, Teleudrilus with 15 species, Polytoreidus 

 with 22 species, Iridodrilus with two, Malodrilus also 

 with two, Nemnanniella with eight, Eiq^olytoreutiis 

 with two and Teleutoreutus wath only one species. 



This completes the list of the Eudrilidae. We 

 will take the huge family Megascolecidae next ; and 

 we find in tropical Africa that the genus Dichogaster 

 alone contains at least 93 species confined to Africa, 

 as well as a few which it shares in common with 

 America, and the common and widely spread D. holavi 

 which has even made its way to Europe. Of the sub- 

 family Ocnerodrilinae we have the genus Gordiodrilus 

 with seven species, a genus which also occurs in 

 Madagascar and the West Indies : Nannodrilus with 

 three species, DiapJwrodrllus with one species and a 

 few examples of Ocnerodrilns and its sub-genera, some 

 of which are also forms that occur elsewhere in the 

 world, for example Nematogenia jmnamensis. Of 

 Pygmoiodrilns there are eight or nine species. 



Of the sub-family Acanthodrilinae the Cape region 

 of South Africa harbours some seven species of the 

 genus Notiodrilus, of which one however is a West 

 African form. The allied Chilota has 13 species, and 

 there is a peculiar genus Holoscolex near to Yagansia 

 with one species. We next have to deal with the 

 Geoscolecidae, of which a sub-family, Microchaetinae, 



