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has no bristles. Plie bristle of the second joint is powerful and is about the total length of the
seven distal joints; ventrally it is furnished with short, stilf secondary bristles but has no spines;
only in exceptional cases (cf. A. aberrata) are these secondary bristles relativelv long; distallv
it has a fine point. The bristles on the third to the eighth joints are long, powerful natatorv
bristles, some of which are sometimes almost double the length of the exopodite. These bristles
have rather long but comparatively narrow natatory hairs and are furnished with short spines
along a large part of the ventral side; these spines are as a rule rather strong on the proximal
natatory bristles, very weak on the distal ones; in a number of species I have even been quite
unable to observe them on the most distal of these bristles (with Reichert’s oc. 4, Leitz’ imm.
Via) (quite missing?). The end joint has three or four bristles, two of which are developed as
long natatory bristles. On these two, which always seem to be somewhat shorter than the other
natatory bristles, I have succeeded in observing, at least in some cases, weak ventral spines;
in most cases, however, there seem to be no spines at all on these bristles. These two bristles,
like the other natatory bristles, are furnished distally with a short, fine hair, but apart from
this they are not difîerentiated«as specific sensory organs. The two remaining, dorsal, bristles
of the end joint have short hairs but have no spines; one of them is often about as long as the
total length of the four or five distal joints, the other is somewhat shorter; one of them
may sometimes be quite absent. The fourth to the ninth joints — less frequently the third
to the ninth — are each often furnished with a basal spine. These spines are often broadly conica 1;
the one on the ninth joint is the largest, being sometimes about as long as this joint, the others
decrease more or less uniformly in size and strength the more proximally they are attached, the
proximal one being in most cases rather weak, somtimes even scarcely perceptible. In a number
of species, however, the number of basal spines is reduced, sometimes they are even quite absent.
Distally-dorsally on the second to the eighth joints there is a series of hairs, in most cases verv
short and rather coarse, or of weak spines; on one or more joints, difïering in different species,
they are sometimes not inconsiderably longer than on the other joints. On the first joint there
were observed in most of the species described in this work one or two transverse rows of fine,
rather short hairs dorsally near the distal boundary. The endopodite is more or less
clearly three-jointed and has only one bristle, the distal bristle of the end joint; this bristle is
closely and finely annulated, of about uniform thickness and is rounded distallv. Sometimes
a short bristle was observed distallv on the second joint; this was obviously abnormal.
Male: — Both the protopodite and the exopodite are considera bly
more strongly developed than in the female. Exopodite: The proportions between the
joints are somewhat different from those of the female (cf. the descriptions of the species). The
bristle of the second joint is considerably lengthened, but it is not quite so long as the natatory
bristles on the nearest joints. The end joint has three long natatory bristles, as one of the short
bristles of the female is rather considerably lengthened — but not quite so long as the natatory
bristles of the nearest joints — and is provided with well-developed natatory hairs. In species
with four bristles on the end joint the fourth bristle is also somewhat longer than in the female
and is provided with well-developed natatory hairs. The natatory bristles on the third to the
ninth joints are also somewhat longer than in the female. All the bristles are without anv spines.
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