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seventh joint the b-bristle is moderately long, about equal to the length of the anterior sides
of the second to the fourth joints (about 19—20 mm. in specimens with a length of shell of about
6.7 mm.); it has five scattered, moderatelv long, sensory filaments; its distal third is without
any short sensory filament such as is found on most of the other end bristles. The c-bristle is
somewhat longer than the former one, about 2,8—3.1 mm., i. e. not quite so long as the whole
antenna; it has ten sensory filaments, nine rather long ones and a vervshort distal one. The
f- and g-bristles of the end joint are subequal, very greatly lengthened, being about as long as
the whole shell or even somewhat longer (on specimens with a shell about 6,7 mm. long these
bristles had a length of from 6,8 to 7,1 mm.); with scattered and moderately long filaments
varying somewhat in number, sometimes similar on both sides, sometimes different, different
both on the right and the left antenna and from one specimen to another; the number observed
was 18—21, the distal one of which was exceedingly short. The sensory filaments on ail the
bristles of the seventh and eiglith joints are bare. The simple sensory bristles d and e are
subequal and almost as long as the third to the eighth joints. Pilosity: The second and third joints
are only weakly furnished with hairs, the rest of the joints seem to be quite smooth.
Second antenna: — Protopodite: Length about 2 mm. in specimens
about 6,5 mm. long. The medial-distal bristle is almost completely reduced and is considerably
shorter than the proximal bristles on the first joint of the endopodite. Exopodite (fig. 11):
The first joint is somewhat longer than the total length of ail the following joints; the second
joint is about as long as the total length of the third and fourth joints, the third is about equal
to the total length of the fourth and fifth or a little shorter, the remaining joints are subequal.
The bristle of the second joint is very weak, quite bare and only about half the length of the
third joint. The proportion between the length of the long natatory bristles and the total length
of the exopodite is about three to two. The former have very wide natatory hairs (cf.
fig. 12), which issue along the whole length of the bristle and even near the point where the
bristle is attached. The end joint has four bristles, of which even the two dorsal ones are
well developed; the shortest dorsal one, which, like the three others, has wide natatory
hairs situated close together along its whole length, is about as long as the total length of the
eight distal exopodite joints. The third to the ninth joints have short, conical and almost
reduced basal spines; that of the end joint especially is extremely weak, sometimes even difficult
to verify with certainty; the basal spines are sometimes provided with fine secondary teeth. The
endopodite (fig. 13) is small, verruciform and more or less distinctly two-jointed. Proximally
on the first joint there are four subequal, moderately long, bare or almost bare bristles. Distally
on this joint there is a single bristle, in most cases somewhat shorter than the four proximal
ones and of the same type as these. The bristle of the end joint is rather long, about a quarter
of the length of the protopodite of this limb.
M a n d i lb le: — Protopodite: The endite on the coxale has over the greater
part of the dorsal-lateral and dorsal-medial sides only a few short and rather weak spines;
ven trally and distally, on the other hånd, the spines are numerous and rather long and powerful.
Distally it is weakly bifurcated; the two points are a good deal more powerful than the other
spines and are furnished with a few secondary spines; between these two points there is a low
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