188 BRITISH ANNELIDS.
their size, whereas in the dendrobaenic form they are exactly like
those of the other tree-frequenters. This is the sole distinguishing
mark between the two forms.
The girdle occupies six segments (31-36), two of which carry
papillae (32: 34). The first dorsal pore is between segments 5 and 6,
and modified setae occur on 31, 32, 35, while tumidities are found
on the 9th (or 10th), 25th, and 26th segments. There are about
100 segments in the average worm. So far I have not seen the
terrestrial form from Essex ; but among some Dendrobaenes taken
from old trees in Epping Forest I have found one or two specimens
of var. rosea. Spermatophores are found on the terrestrial form.
4. The Gilt-tail (Allolobophora subrubicunda, Eisen), is the
most ubiquitous and protean species in the group, and it can adapt
itself in a wonderful way to its environment. I find no fewer than
three well-marked forms or varieties, in addition to the typical tree-
haunting species. These merit a note. The type is found inside
old decaying timber, or under the bark of rotting trees. It resembles
the other three species in its brown colour, wide setae, pallid lip, and
other particulars. The girdle usually begins on the 25th, and ends