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of the incisur there is a moderate number of scattered and moderately long bristles. Besides
these bristles there are only a rather few moderately long bristles in the incisur, most of which
are scattered, some perhaps with a îaint indication of being arranged in a row running somewhat
inside and about parallel to the ventral margin of the rostrum. On the part just behind the
incisur there are also only sparse medial bristles, of which those situated nearest the margin
of the shell are moderately long and are arranged in a sparse row running about parallel to and
somewhat inside the margin of the shell; those situated farther in are short and scattered.
Along the middle of the ventral margin of the shell there is a not ineonsiderable number of rather
short bristles, arranged in a rather distinct row running about parallel to and somewhat inside
the margin of the shell. Along the posterior part of the ventral margin there are only single
short bristles. At about half way between and running parallel to the ventral quarter or third
of the spine-bearing list and the margin of the shell there is a sparse row of moderately long
bristles. The spine-bearing list has 21—22 hyaline spines; in addition there are a moderate
number of short bristles, in most cases two or three between the dorsal spines, one or two between
the ventral ones. Between the spine-bearing list and the posterior margin of the shell there
is a ridge similar to that in A. norvegica and close to this ridge there are also broad and fine
pores such as are to be founcl in this species.
First antenna (fig. 3): — This is very like that of A. Grimaldi. It is to be noted:
The original third and fourth joints form together a joint that is somewhat, though only slightly,
shorter than it is high and also somewhat shorter than the total length of the original fifth and
sixth joints. The anterior bristle of the second joint is about as long as or rather slightly longer
than the anterior side of this joint. In the specimen investigated the original third joint had
on the anterior side five bristles on the right, four bristles on the left antenna (one or two bristles
respectively broken oft’?). Of these bristles nos. 2 and 4 were unusually short, only about half
as long as no. 1. The stem of the sensory bristle of the fifth joint relatively short, only about
as long as the total length of the two penultimate joints; with seven sensorial filaments. The
number of sensorial filaments on the c-, f- and g-bristles could not be décidée! on account of
the defective condition of these bristles. Pilosity: The first and second joints have abundant
groups of short, fine, stift hairs (only indicated in the accompanying figure), but there are no
hairs along the distal boundary of the second joint. There is a series of short hairs anteriorly
on the distal boundary of the (original) fifth joint.
Second antenna: — Distally-medially close to the exopoclite there is a short
bristle on the protopodite. The exop odite has no basal spines at ail. The
endo-p o dite is weakly three-jointed; its end bristle is almost twice as long as the stem
(about 14 : 7,5).
Mandible (fig. 4): — Protopodite: Coxale: The scythe-shaped process (fig. 5):
The part distally of the main spine narrows evenly and gently into a fine point; its ventral edge
is uniformly and weakly convex, almost straight. The distance from the point of the process
to the main spine is somewhat greater than the distance from the latter to the proximal ventral
spine. The dorsal bristle is attached somewhat nearer the point of the process than its distance
trom the main spine and considerably more distally than the latter: it extends a not ineonsiderable
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