AN ATTEMPT TO CLASSIFY EAETHWORMS. 267 



IV. Tabular Summary of Generic Characters. 



I have here brought together the main characters of the 

 various genera in a tabular form, the genera being arranged 

 alphabetically. The information is, of course, condensed, and 

 the terms employed are defined in the chapter dealing with 

 nomenclature. 



V. Index to Identification of Genera. 



In addition to the following '' tabular summary " it has 

 occurred to me that it would be useful to zoologists examining 

 earthworms to have the genera arranged in such a manner 

 that identification to some extent may be rendered less diffi- 

 cult, as it is by no means an easy matter to distinguish many 

 of the genera from one another, and I have found a table of 

 this sort a great help to myself. 



In order to add to its usefulness I have appended to each 

 genus the page in this memoir in which will be found further 

 details and references to papers on the genus. 



