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quite half the length of the following joint, the posterior bristle of this joint is still shorter.
The bristle of the sixth joint is about as long as the anterior bristle of the fourth joint, the
a-bristle of the seventh joint is about twice as long as this. All thesc ’bristles have short hairs
or are ahnost bare; the hairs on the a-bristle of the seventh joint are very coarse, almost
spine-like. The sensory bristle of the fifth joint is about as long as the anterior side of the six
distal joints. Of its thirteen sensory filaments — all of them without secondary spines — the
nine proximal ones are relatively long — about a third of the length of the bristle — and thick
in comparison with the distal ones; the three following ones are considerably shorter — about
a fifth of the length of the bristle — and narrower, and are attached considerably distally of
the former ones; the remaining filament is very short and narrow and is attached near the point
of the bristle. Of the distal bristles the c-, f- and g-bristles are subequal and slightly shorter
than the anterior side of the seven distal joints, the b-bristle (measured to the point of its longest
distal filament) is about a third shorter than these three. The b-bristle (see fig. 13) has five
filaments. The proximal one of these (hg. 14) has no trace of anv verruciform swelling distally
of the sucker (such as is found in, for instance, C. (Vargula) norvegica, see above, fig. 15 of this
species). Of the four otlier filaments on this bristle the three distal ones issue almost at the
same point, rather close to the point of the bristle, the fourth is fixed somewhat proximally of
the middle of the bristle. Two of the three distal filaments are bare and comparatively short
and narrow, the third is long and rather powerful — extending far beyond the point of the
bristle — like the one fixed somewhat proximally of the middle of the bristle. Of these long
filaments the proximal one is furnished distally with from nine to eleven, the distal one with eight
or nine, small suctorial organs, proximally of which one or two verruciform spines may be found.
The c-bristles has ten filaments altogether. The proximal one of these is of the same type and
strength as the corresponding one on the b-bristle. Seven filaments are of the same type as
those of the f- and g-bristles (see below) but are bare or with only a few very short, fine secondary
spines. Proximally of these seven filaments and between nos. 2 and 3 of them we find two
long and rather powerful filaments (of the same type as the two last-mentioned filaments on the
b-bristle), the proximal one having distally nine or ten, the distal one eight or nine small suctorial
organs, proximally of which one or two short spines are found. The f-bristle has ten and the
g-bristle eleven filaments of moderate length; most of these filaments (fig. 12) have two kinds
of secondary spines, some, about two or three, strong and scale-shaped, the others short and fine;
the distal filaments are cither furnished only with secondary spines of the latter kind or else
they are quite bare. The simple sensory bristles d and e are subequal and somewhat less than
a third of the length of the last-mentioned bristles. Pilosity: The second joint has numerous
transverse rows of short, fine hairs on both the anterior and the posterior sides. Apart from
these this antenna is bare.
Second antenna: — Protopo dite: Length, about l.G—1,7 mm. The
medial-distal bristle is short, being about as long as the shorter of the proximal bristles of the
first endopodite joint; it is bare or almost so. The exopodite lias about the following
proportion between the joints:
1 : 11 : 111 : IV : V : VI : VII : VIII : IX = 31 : (5 : 3 : 3 : 2 : 2 : 2 : 2 : 1.
43
Zoolog, bidrag, Uppsala. Suppl .-Bd. 1.
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