v] RELATIVE FREQUENCY 95 



range from Burmah in the east to Sumatra and 

 Borneo further east, though they are not recorded 

 from intermediate islands. Perionyx is found in 

 Burmah, India, Zanzibar, Sumatra, and Java. There 

 are other examples of genera which have much the 

 same range as those enumerated. Finally there are 

 those which are confined to one land mass and very 

 often to a restricted region of that. Thus Kynotus 

 is confined to Madagascar, all the genera of Eudrilidae 

 to tropical Africa, some of them, e.g. Beddardiella 

 and Euscolex, to very limited tracts, others to wider 

 or less wide areas in that continent. Maoridrilm is 

 only found in New Zealand, to the South Island of 

 which also is confined the genus Neodrilus. To the 

 Cape region of Africa is limited Microchaetus\ and 

 to a belt running across the northern part of the 

 tropical region and extending down the Nile, the 

 remarkable, partly aquatic, Alma. 



As a kind of appendix to these facts and con- 

 clusions we shall next deal with certain widely spread 

 forms that have been already referred to, with the 

 range of different genera over great land masses of 

 the world, and with the earthworms of oceanic islands. 



