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stage, tliese lengths vary somewhat. The s e v e n t h I i m b is of the definitive type with
two distal bristles, one long and (aie short one. The number of bristles on the o t h e r 1 i m b s
is only very slightlv decreased. The jienis consists of two very small embryonal processes.
Each f u r c a 1 lamella has six claws,
which decrease fairly regularly in length
and strength the more proximally they
are situated.
Fern ale: Shell: Average length,
1,00 mm. It is of the same type as in
the male of this stage; the secondary teetli
on the postero-dorsal spine are, however,
somewhat less developed. The r o
d-shaped organ is similar to that of
the male in this stage. The 1 i m b s are
about the same as in the female of the
preceding stage. The f n r c a is similar
to that of the male in this stage.
There cannot be the slightest doubt
that these two larval stages really belong
to C. elegans, as in the region from which
these spécimens were obtained there are,
except the species mentioned, only two
forms of the genus Conclioecia, namely
C. obtusata G. 0. Sars and G. borealis
G. O. Sars; there is no risk of confusion
with either of these species during the
two oldest larval stages.
It seems also to be quite certain
that they represent two moults. The
agreement with the observations of
C. Claus and G. W. Müller is
complete; cf. the latter author, 1894,
pp. 183, 184.
Measurements: —
258 specimens of this species from
tlie station mentioned were investigated
and measured. The measurements of the lengths of the shells gave the following result, as
shown graphically in fig. XXI1.
The above table shows that the specimens could be divided into three distinct male
and three female classes according to the lengths of their shells. The male dass 58—fil and the
female 53—60 represent mature specimens.
Fig. XXII. — Curves showing the results of niy measurements of
the lengths of the shells of a number of specimens of Conchoecia
rlrgans from Koster, west coast of Sveden. — = the females;
–––- = the males. The abscissa represents the lengths of
the shells expressed in divisions of a micrometer (27 divisions
1 mm.): the ordinate represents the number of specimens
measured.
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