Lumbricus, as already mentioned, is distinguished from all Allolobophora except A. eiseni, by the complete dovetailing of the prostomium into the first segment. There are five species in this country which may be thus distinguished by the position of the tubercula pubertatis. The most familiar species is the common L. rubellus.

L. rubellus Hoff. tubercula pubertatis are on 28, 29, 30, 31

L. castaneus Sav. tube"cula pu"ertatis a"e on 28, 29, 30, 31, 32

L. herculeus Sav. tube"cula pu"ertatis a"e on 28, 29, 30, 31, 32 33, 34, 35, 36

L. papillosus Friend tube"cula pu"ertatis a"e on 28, 29, 30, 31, 32 33, 34, 35, 36, 37

L. festivus Sav. tube"cula pu"ertatis a"e on 28, 29, 30, 31, 32 33, 34, 35, 36, 37, 38.