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shorter than the three short bristles on the first endopodite joint (cf. below) and almost bare.
Exop odite: This has about the following proportions between the joints:
I : II : III : IV : V : VI : VII : VIII : IX 38 : 13 : 5 : 4 : 4 : 4 : 3 : 3 : 2.
In other words the first joint is about as long as the total length of all the following joints
and the length of the second joint is about as great as that of the three following ones together;
the lengths varv somewhat, however, though rather slightlv. The bristle of the second joint
is about as long as the total length of the six or seven distal joints and has ventrallv some
rather weak spines, which vary rather considerably in number (from about fifteen to twenty-five)
and dorsally, on the average, a rather smaller number of short, still weaker ones. The longest
natatory bristles are almost double the length of the whole exopodite and have rather broad
nata tory hairs. The end joint has four bristles; of these the dorsal one is about as long as
the three or four distal joints, its hairs are long but comparatively few in number. The
third to the ninth joints have basal spines of the same type as those fourni in C. (Vargida)
norvegica, but they are, however, somewhat weaker. Endopodite (fig. 7): The end joint
is sometimes not very well defined. The first joint has proximally a group of four bristles, three
of which are comparatively short; in addition this joint has at about the middle a single bristle,
somewhat longer than the longest proximal one and about as long as or somewhat longer than
the two distal joints of the endopodite; all the bristles of the first joint are sparsely furnished
with short and fine hairs. The second endopodite joint is quite without bristles. The bristle
of the end joint is about double the length of the endopodite and almost reaches the posterior
limit of the protopodite.
Mandible (fig. 4): — Protopodite: The endite of the coxale has very
numerous spines; its two distal points are generally somewhat stronger and thicker than the
other spines, though only slightly so, and, contrary to the latter, are furnished with a few weak
secondary spines; between the two distal points a 1owt point can sometimes be observed; cf.
above p. 182. Basale: The ventral side has seven bristles; two of them, the a-bristles, are
situated at the proximo-ventral corner; one of these is quite short, the other relativelv long,
attaining about half the length of the ventral side of this joint; the b-bristle is very small;
somewhat proximally of the middle of the joint there are two c-bristles, one of which is not
quite as long as the longer of the two a-bristles, the other is exceedingly small, even very diffieult
to distinguish; in addition there are two d-bristles, one of which is quite short, the other long,
of about the same length as the second endopodite joint; the last-mentioned bristle has along
a great part of its length very numerous rather long secondary bristles, only slightly arranged
in groups; the other bristles of the ventral side of this joint are furnished with short hairs or
naked. The proximal one of the three bristles of the dorsal side of this joint is situated somewhat
in front of the middle of the joint and is about half the length of the latter; the two distal
bristles are subequal and rather slightlv longer than the proximal one; all three of them have
short fine hairs. The exopodite is rather considerably longer than the dorsal side of the
first endopodite joint. Of its two bristles, botli furnished with short, fine hairs, the one situated
most distally is somewhat longer than this branch, the other is about twice as long as the first.
Endopodite: Of the four ventral bristles on the first joint the two longest are somewhat
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