64 BRITISH ANNELIDS.
Setae always in couples, four couples on each segment, the individuals
of which are close together [not ornamented, copulatory setae
longer, common setae f shaped].
Clitellum always composed of six segments, usually closely fused,
commencing somewhere between 27 and 34. [In L. rubellus the
girdle sometimes occurs abnormally on segments 26 to 31.]
Male or spermiducal pores on segment 15, with or without papilla;.
Tubercula pubertatis occupying four contiguous segments of the clitel-
lum, omitting the anterior and posterior rings, and forming a
distinct band along or near to its ventral limit.
Colour, purplish brown with iridescence, lighter ventrally, and with
the clitellum paler than the anterior portion.
First dorsal pore either between segments 5 and 6, or posteriorly to
this. Anus terminal.
The internal characters are omitted with a view to preventing the
student from being discouraged because he may be unable to dissect
his specimens. In all the foregoing points, except those in brackets,
the genus Lumbricus differs from Allolobophora, so that the two may
be readily distinguished. The accompanying chart will enable the
young naturalist readily to determine his species if he happens to
have found a genuine Lumbricus; and I have added the characters
of the new species in the hope that some one will be able to recog-
nise it among the indigenous earthworms of Essex.
Chart of the Genus Lumbricus.
I take this opportunity of thanking my correspondents for the
assistance they have thus far rendered me, and would like to indicate
the work which still needs to be done.