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The fourth to the ninth joints of this branch each have a basal spine. The en cl op odite
is distinctly three-jointed; its distal bristle is slightly longer than the stem.
Mandible: — Pro topodite: Coxale: The scythe-shaped process (figs. 8, 9):
The part distally of the main spine narrows uniformly and gently into a fine point; its ventral
edge is even and rather decidedly convex. The distance from the point of the process to the
main spine is about as long as or somewhat longer than the distance from the latter to the
proximal ventral spine. The dorsal bristle is fixed at about a similar distance from the point
of the process as from the main spine and at a distance of about its own length distally of the
latter; it extends only slightly distally of the point of the process. The dorsal serrate teetli are
very weak; some are scarcely developed. The main spine is moderately strong. There are
six ventral spines; of these the three proximal ones are rather strong, the distal ones sometimes
rather weak; the distal one, or sometimes the two distal ones, is pointed proximally. On the
part distally of the main spine there are seven or eight transverse rows of hairs. The rod-shaped
process has three or four short, strong distal spines. Basale: The backward pointing process
has four end bristles, three or four triaena bristles and two dwarf bristles. The triaena bristles
have from three to fifteen pairs of secondary spines under the main pair of spines. The glands
emerge on a rather weakly developed papilla (this papilla is weaker than in fig. 9 of A. spinifera).
Dorsally at about the middle this joint has five rather short bristles, subequal or of somewhat
different lengths, equipped on the anterior side with short, fine hairs (the species has
derived its name from this character); close to these bristles there are groups of short, fine,
stiff hairs (fig. 7). The e x o p o d i t e is, if its two end bristles are included, about as long
as or rather slightly shorter than half the length of the anterior side of the first endopodite joint
(fig. 7). Endopodite (figs. 7 and 10): Of the three ventral bristles on the first joint the
shortest has short, fine hairs, the two others are furnished with short secondary bristles
proximally of the long secondary bristles; on one bristle about ten to fifteen, on the other about
twenty to thirty pairs of similar short secondary bristles were observed. This joint is not armed
with spines antero-distally. The second joint has two proximal bristles of somewhat different
lengths; the longest is somewhat less than half the length of the main bristle a. Between the
main bristles b and c there is a long narrow bristle with short hairs. The medial cleaning bristles
are rather numerous and are arranged in two rather steeply descending rows. They vary to
some extent; three specimens that were investigated showed the following conditions:
Type specimen: Right mandible
6 bristles in a distinct lower row.
i „ „ „ „ upper „
1 bristle above bristle no. 2 of the latter row.
( 6 bristles in a distinct lower row.
Left „ 5 „ „ „ upper „
I 1 bristle above bristle no. 2 of the latter row.
Specimen no. 2. Right
( 6 bristles in a distinct lower row.
5 „ „ „ upper „
I 1 bristle above bristle no. 2 in the latter row.
60
Zoolog, bidrag, Uppsala. Suppl.-Bd. i.
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