1908.] W. MiCHAEivSEN : Oligochœta of the Indian Empire and Ceylon. 



121 



(3) The side branch consisting of Perionychella, Perionyx and Lampito (fig. iv 

 in the text) shows only in its oldest member relations to Australia, four 

 Perionychella species occurring in Victoria and Queensland. On the other hand 

 these genera are restricted to our region, Perionychella occupying the 

 Himalayas, Lampito South India, and Perionyx being spread over the whole region. 



Probably this group of genera got its most important developxnent not before 

 having settled in our region, the genera Perionyx and Lampito having originated 

 within this region from the older Perionychella, after its immigration into India. 



(4) The phyletically youngest genus Pheretima (fig. v in the text) enters and 

 occupies Burma and the Andaman Islands, advancing from the centre 



of its Malayan headquarters. Some outposts of this genus have reached 

 Bengal, and perhaps some other localities of the Indian region. On the other 

 hand this genus seems to be restricted to the Malayan archipelago, having a number 



