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shell there is a moderate number of rather short bristles, arranged in a single distinct row.
Posteriorly, somewhat in front of the spine-bearing list, this row becomes very dense and at the
same time the bristles become longer and coarser; it continues up along the ventral quarter or
third of the spine-bearing list, running about half way between the latter and the margin of
the shell (fig. 5). The spine-bearing list has rather few hyaline spines, about 19—20, of somewhat
varying size, and has a sparse row of short bristles, about one or two between each hyaline
spine. The double line drawn in hg. 5 inside the posterior margin of the shell corresponds to
a sharp ridge; the part of the shell between this ridge and the posterior margin of the shell is
situated rather considerably laterally — i. e., when the shell is looked at from inside, it is
consid-erably deeper — of the part between the ridge and the spine-bearing list; a ridge of this sort
is characteristic for both the valves. Just inside the dorsal half of this ridge there is a sparse
row of broad pores (six such pores were always observed on the specimens investigated) ; in the
specimens investigated these pores did not seem to be furnished with low hyaline pegs. In
addition a rather dense and irregulär row of fine pores issues near this ridge.
First antenna (figs. 6 and 7): — This is very like the corresponding limb in
A. Grimaldi. We may note: It is seven-jointed, the third and fourth joints are not united to
each other. Of the six anterior bristles on the third joint no. 5 has short hairs. The a-claw
on the end joint is only slightly longer than the anterior side of the fifth and sixth joints; it has
only extremelv weak pectination dorso-proximally. The f-bristle has five, the c- and g-bristles
six or seven sensorial filaments. The first and second joints are rather abundantly furnished with
hairs; the second joint, however, as in A. Grimaldi, has no row of hairs along the distal boundary.
Second antenna (fig. 9) : — Very like that of A. Grimaldi. The protopodite
has a short bristle disto-medially close to the exopodite. Endopodite: On one specimen
this was abnormally developed on one side, reminding one very much of this branch in the
male in the penultimate larval stage; the second joint had a very small bristle near its distal
boundary; the bristle of the end joint was displaced somewhat proximally (fig. 10).
Mandible (fig. 11): — Protopodite: Coxale: The scythe-shaped process
(fig. 12): The part situated distally of the main spine grows narrow rather rapidly, but
not so rapidly as in A. Grimaldi, into a fine point; its ventral edge is slightly concave
distally and slightly convex or almost straight proximally; it forms, just near the main
spine, a rather weak spine which points proximally. The distance between the point of the
process and the main spine is rather slightly shorter than the distance from the latter to the
proximal ventral spine. The dorsal bristle is fixed somewhat nearer the main spine than its
distance from the point of the process, and somewhat, though only rather slightly, distally of
the main spine; it extends rather slightly beyond the point of the process. The dorsal serrate
teeth are rather few in number, but comparatively large. The main spine is rather strong. There
are four ventral spines, the two distal ones of which are rather weak, the two proximal ones
rather strong. Between the distal ventral spine and the main spine the ventral edge is finely
serrated; the serrate teeth point proximally; this serration may sometimes be more or less
completely missing — presumably on account of wear. On the part distally of the main spine
there are only a few — two or three were observed — transverse rows of hairs. The rod-shaped
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