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proximally and inwards ; the other claws have at this part a cluster of bristles, varying somewhat
in nuniber. On the lamellae there are usually no long, stiff secondary bristles medially near
the four or five anterior claws; medially near the posterior claws, on the other hand, there are
often rather sparse bristles of this kind. At the anterior side of the first claw the lamellae often
have short, fine hairs; behind the claws too the lamellae have short, fine hairs. Apart from these
they are in most cases quite without hairs.
The rod-shaped organ (fig. 5, = $): In specimens with shells from 2,7 to
3 mm. long the rod-shaped organ was from 0,5 to 0,6 mm. long. In most cases it was
weakly bent ventrally; it is quite without joints; somewhat proximally of the middle the
wall seems, however, somewhat weak (the organ is flexible here?); distally it is finely rounded;
it is smooth.
Male: —
Shell: — Length 2,4—3,2 mm. As in the case of the females, large individuals, with
shells from 2,9 to 3,2 mm. long, are fourni only in nortlierly locales, for instance at Greenland
and Spitzbergen, etc. The males seem, on the average, to be slightly longer (not shorter, as
other authors have stated, e. g. G. W. MÜLLER, 1901, p. 10) than the females from the same
locale. Length : height, about 1,7 : 1; length : breadth about 2:1. Seen from the
side (fig. 1), it has its greatest height at about the middle. The ventral margin is somewhat
less arched than in the female; it has no pouting behind the incisur. The posterior projecting
corner of the shell is rather broadly rounded; above this corner the margin of the
shell is straight or weakly concave. The anterior and ventral corners of the rostrum,
especially the latter, are well-rounded; the ventral corner has no spine-like process. The rostral
incisur is almost rectangular; the small verruciform process, which in the female forms a boundary
between it and the ventral margin of the shell, is practically absent altogether. Seen from
beneath (fig. 2), it is of about the same type as the shell of the female, but somewhat
narrower. Surface of the shell: The sculpture is somewhat more weakly developed
than in the females. It has a few scattered bristles, some short and some long, just as
in the female; the long ones, situated especially on the posterior part of the shell, are
of the same type as the long ones in the female, but rather considerably longer. Seen
from within: With regard to medial bristles and selvage there is a fairly close
resem-blance between the two sexes.
First antenna (fig. 8): — Most of the bristles on the second to the fifth joints
are somewhat shorter than the corresponding bristles in the female; with regard to the foui
posterior bristles on the fourth joint it is to be noted that the two middle ones are somewhat longer
than the medial and the lateral ones. In most cases there are no long secondary bristles on the
anterior bristle of the second joint, on the shorter of the two anterior bristles of the third joint
and on one to three of the four posterior bristles on the fourth joint. The sensory bristle of the
original fifth joint has four sensorial filaments distally, situated in the same way as the distal
sensorial filaments on the c-, f- and g-bristles of the female (cf. fig. 9). End joint: The a-bristle
is about as long as the fifth joint and has no long secondary bristles. The b-bristle is about as
long as the anterior sides of the third and fourth joints; it has two proximal and four distal
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