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First antenna: — This shows no or only rather slight dimorphism. — It is rather
short and moderately strong, growing gradually narrower distally. The two distal joints are
in most cases rather strongly bent downwards and in most cases too the second joint forms,
with the first, a rather distinct and ventrally open knee. The second joint has dorsally a single
pointed bristle of the ordinary type. The next distal joint has two, the end joint three, long
bristles; apart from these this antenna is quite without bristles. Of the five bristles on the two
distal joints the distal (anterior) one on the end joint is longer and has, at least proximally,
somewhat thicker walls than the otliers. In the male this bristle does not or at any rate not
to any extent co-operate in seizing the female; it has both in the male and the female the same
armature as in most cases characterizes this bristle in the females of the genus Conchoecia, i. e.
it has a greater or less number of short hairs along the posterior side at or in most cases somewhat
distally of the middle. The four remaining bristles on the two distal joints are most frequently
subequal and are differentiated as thin-walled, bare, rather narrow sensory filaments, of about
equal thickness throughout their whole length.
Second antenna: —
Male: — The protopo dite has a verruciform appendage distally-laterally.
(It is to be noted, however, that this character is not known in most of the species of this genus.)
Exopodite: The first joint is of about the same thickness throughout its whole length.
Endo-p o d i t e: The first joint is moderately large, more or less square with rounded corners, without
the processus mammillaris. The second joint is rather short, but power fui. It is always armed
with four bristles, namely the c-, d-, f- and g-bristles; the e-bristle always seems to be absent.
Of these bristles the c- and d-bristles are rather short and weak, pointed and of the ordinary
type. The f- and g-bristles, on the other hand, are comparatively long, the g-bristle is always
longer than the f-bristle; they are both rather powerful proximally, hyaline distally and obviously
function as sensory organs. The proximal shank of the clasping arm of the end joint is short,
especially on the left second antenna, the distal one, on the other hand, is rather long. The
three bristles on this joint, the h-, i- and j-bristles, are subequal, always shorter than the
f-and g-bristles; they are developecl as hyaline, thin-walled, uniformly thick filaments and are
attached at or somewhat proximally of the boundary between the proximal and distal shanks
of the clasping arm.
F e m a 1 e: — The protopodite is similar to that of the male. Endopodite:
This has three joints (always?). The first joint is about the same as that of the male, only slightly
weaker. The second also is similar to that of the male, but it has only two bristles; the c- and
d-bristles are absent; the f- and g-bristles are (always?) the same as in the male. The end joint
is very short, but (at least in some cases) is distinctly marked off from the second joint*; it is
fixed a rather long distance proximally on the latter joint; it has three bristles, which are (always?)
quite or almost cjuite identical with those of the male. There is a low peg between two of these
three bristles (for the morphological value of this process see the remark below under this genus).
The m a n d i b 1 e, maxilla, f i f t h, s i x t h and seventh 1 i m b s, penis, furca and
lips are so incompletely known in most of the species of this genus that have so far been
* Not observed by previous writers.
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