Studies on Earthworms. - Journal of Cell Science

226 WILLIAM BLAXLAND B.ENHAM.
I. Perichaetas without papillae.
a. With one pair of spermathecae.
P. quadragenaria, from the East Indies.—Length 210
mm., breadth 4 mm. The setse are about 40 to each somite.
The spermathecae are only two in number, in the
somite VIII ; their aperture is in the anterior part of this
somite, and each consists of a globular sac in somite VIII, and
narrow coiled appendage with enlarged extremity in the somite
VII.
P. elongata, from Peru.—Length 355 mm., breadth 4 mm.
The number of setse is not mentioned. The spermathecEe
are only two in number; their pores are between somites iv
and v, but whether they lie in the somite iv or in v is not
stated. They consist each of a single sac, and have no accessory
parts.
b. With more than two pairs of spermathecse.
P! Houlleti, from Calcutta and Cochin China, is very fully
described. Length 1 dcm.
There are forty-five to fifty setse round each somite.
There are three pairs of spermathecae, lying in somites vn,
VIII, and is, and opening on the anterior edges of these
somites. Each consists of three parts; a large ovoid sac, with
a coiled tube opening into its duct, lying in the somites
named; whilst a very much smaller sac, also opening at the
same point, lies in the preceding somite in each case.
[P. cingulata, Sch. will come in here.]
II. Perichsetae with papillae.
a. With two pairs of spermathecae.
P. aspergillum (habitat unknown).—Length 370 mm.,
breadth 10 mm. There are about eighty setse round each somite.
The spermathecse are in two pairs, in somites VIII
and ix, with their pores in the anterior region. Each is a
simple, large, and somewhat globular sac; but there are numerous
smaller sacs round it, each having a separate pore j
some lying in the same somite as the spermathecse, others in
the somite in front. So that, both in front and behind each