v] RELATIVE FREQUENCY 83 



species occur, such as D. malayana and D. saliens. 

 But these are by no means certainly to be looked 

 upon as real natives of the situations within this area 

 where they occur. This completes the scanty list of 

 genera found in the region under consideration ; for 

 one Moniligastrid (31. barwelli) is hardly to be looked 

 upon as indigenous. We have therefore to record 

 here but five genera, of which only two are certainly 

 indigenous and probably also confined to the region ; 

 they contain between them certainly two hundred 

 species. 



We next come to the Continent of Australia. The 

 earthworm fauna is again quite without Geoscolecidae 

 and of course Lumbricidae. As to the former there 

 are not even doubtful cases like Glyphiclrilns of the 

 East; for we find only recorded Pontoscolex core- 

 thrurus, a species concerning whose extraordinary 

 powers of migration there is no possible doubt. The 

 same may be said of Eudrilus also recorded from 

 Australia. Here the Megascolecidae are as conspicuous 

 as in the old world generally. We find, however, a 

 great many members of the sub-family Acanthodrilinae. 

 Of the antarctic genus Notioclrilus there are some 

 six species. Microscolex occurs ; but the real habitat 

 of this genus is very doubtful. Biplotrema, with one 

 species, D. fragilis, is not only indigenous to, but 

 confined to, Australia. 



The most prevalent sub-family is that of the 



62 



