The Classification and Distribution of Earthworms. 241 



Cryptodrilus, Fletch. 

 Perissogaster, Fletch. 



Perichgetidse. 



Meyascolex, Tempi. 

 Perichada, Schin. 

 PerionyXj E. P. 



The classificatory scheme is completed on page 19 by a 

 phylogeiietic diagram, which is constructed thus : — 



Lumbricidae. 



EudriUdae. 

 Geoscolecidae. 



Perichaetidae. 

 ? Moniligastridse. 



Acanthodrihdse. 



I now propose to examine this scheme in detail, and to give 

 my reasons for objecting to parts of it. 



Eosa first of all gives his reasons for regarding all earth- 

 worms as referable to a single group, Terricolge, equivalent 

 not to a group, Limicolse, but to each of various divisions into 

 which the Limicola3 may be divided, such as Enchytrseidse, 

 Tubificid?e. Dr Eosa does not commit himself, and there is 

 no necessity for his doing so, to the precise definition of these 

 groups. Vejdovsky, on the other hand, regards his families 

 of earthworms, such as Pontodrilidse, Perich?etidi^, as equi- 

 valent to families of LimicolcT?, such as Phreoryctidre, Tubi- 

 ficidse, etc. There is thus an important difference, duly 

 emphasised by Eosa, between his scheme and that of 

 Vejdovsky, 



