1903. | NEW SPECIES OF EARTHWORMS. 221 
shape of the whole spermatophore is sufficiently elucidated by the 
drawing referred to. 
§ Note on the Clitellum of Alma stuhlmanni, and on a possibly 
new species of the genus Alma. 
I believe that a note by myself’ upon the clitellum and 
spermatophores of a West-African species of the genus Alma is 
the first record of the extent of the clitellum in that genus. Like 
other aquatic forms, Alma seems to be characterised by a seasonal 
development of the clitellum; and hitherto, with the exception 
just mentioned, no one appears to have seen or at least described 
this organ in that Geoscolecid. In the species to which I have 
just referred, the clitellum was found to extend from segment xlv. 
to Ixxxv., a position which is quite unlike that found in any other 
Geoscolecid and present only in a few Lumbricids. This is an 
additional reason for associating the genus dima more particularly 
with Criodrilus, asis done by Michaelsen; for both these genera, 
though referable to the family Geoscolecidee, have many points of 
kinship to the Lumbricidze. As, however, up to the present time, 
but one species of the genus Alma has been described in the fully 
mature condition, it is possible that the position and extent of the 
clitellum characterising that species are not normal but exceptional 
in the genus. Therefore I do not hesitate to describe the con- 
ditions occurring in a second species of the genus, which I owe to 
the kindness of Mr. Cyril Crossland, who collected specimens on the 
shore of Victoria Nyanza, among weeds cast up by the waves. I 
have two fully mature examples of a species which I believe to be 
identical with Dr. Michaelsen’s Alma stuhlmanni. The dimensions, 
however, are rather less; only one of the two examples was quite 
intact —the other had lost the hinder end of the body; in the 
complete example, measurements showed a length of 120 mm. 
The other might have been slightly longer, as it was rather thicker. 
In both, the penial appendages were rather longer than those of the 
original specimens deseribed by Michaelsen. I found them to be 
10 millimetres long; in one example the two were unequal in 
size, one penial appendage only measured 6 mm. The structure 
of these appendages is usually characteristic of the species. The 
worms which T have examined agreed in almost every detail with 
the description of A. stuhlmanni as given by Michaelsen °. 
I may remark, however, that there were only two sete at the 
free end of the penial process, and, indeed, one of these had 
dropped out. The two papille upon which these sete are placed 
were partly encircled by a horseshoe-shaped region of specially 
glandular epidermis, which was conspicuously marked out from 
the rest of the integument covering that process. It 1s conceivably 
this region which secretes the spermatophore. In addition to this, 
1 “On the Clitellum and Spermatophores of an Annelid of the Genus A/ma,” Proc. 
Zool. Soc. 1901, vol. i. p. 216. 
2 “Die Regenwitrmer Ost-Afrikas,” in Deutsch-Ost-Afrika, 1896, p. 4, 
