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just behind the incisur there are rather few or a moderate number of scattered bristles, of whicli
those that are situated near the margin of the shell are moderately long, those situated farther
in more or less short. Along the middle part of the ventral margin of the shell there are a moderate
number of long or rather short, stiff bristles, most of which are arrange«! in a rather distinct
row running somewhat inside the ventral margin. Between the ventral half of the spine-bearing
list and the margin of th<> shell there are rather numerous moderately long, stiff bristles,
some-times arranged in a more or less distinct row, running about parallel to and somewhat inside
the margin of the shell, in most cases, however (as in the accompanying figure 3) arranged more
or less irregularly. Dorsally of these bristles there are a moderate number of scattered, verv
short bristles right up to the dorsal boundary of the bristle-bearing list. About half-wav between
and parallel to the posterior margin of the shell and the dorsal half of the spine-bearing list
there is a sparse row of six or seven broad pores; each of these pores is furnished with a freely
projecting hyaline peg (1 was unable to ascertain with certainty the shape of these pegs). The
spine-bearing list is weakly undulated and is provided with about 32 to 35 hyaline spines,
varyingsomewhat in size, and with a close row of stiff and rather short bristles, varving somewhat
in length; on an average about three bristles were observed for each hyaline spine. Neither
on the right nor on the left valve was there a sharp edge similar to that described and repioduced
as characteristic of the posterior part of the right valve of A. spinifera (cf. this species, fig. 3).
First antenna (fig. 5): — This has six or seven joints; the third and fourth joints
are sometimes free, sometimes more or less strongly united. These two joints form together
one sub-rectangular joint, whose length is somewhat less than its height and rather considerablv
less than the total length of the two following joints. The distal boundary of the fourth joint
is moderately concave. The anterior bristle of the second joint is about as long as the anterior side
of tilis joint. The third joint has six anterior bristles. Of these nos. 5 and 6 and sometimes nos.
3 and 4 as well are situated at the side of each other. Bristles nos. 1, 2, 4 and 5 are armed ventrally
with long, stiff secondary bristles; the secondary bristles on bristles nos. 3 and 6 are short and
fine, often pressed rather close to the bristle, so that they are sometimes rather difficult to observe
with certainty. The longer of the two postero-distal bristles of the fourth joint is somewhat
longer than the fifth joint, but somewhat shorter, however, than the total length of the fifth
and sixth joints. The stem of the sensory bristle of the fifth joint is about as long as or somewhat
shorter than the total length of the third to the sixth joints; it is provided with seven sensorial
filaments. The end joint has seven bristles, thed-bristleisdeveloped, imlikein most of the species
in this genus. The a-claw is decidedly longer than the anterior side of the two next distal
joints and is smooth. The f-bristle has five sensorial filaments. The c- and g-bristles have six
sensorial filaments. The d-bristle is in most cases considerablv shorter and rather considerablv
more siender than the e-bristle. Pilosity: The first and second joints have abundant groups
of short, exceedingly fine, stiff hairs — only just suggested in the adjoining figure — the
antero-distal part of the second joint seems, however, to be always without hairs. There are no hairs
along the distal boundary of this joint.
Second antenna: — The p r o t o p o d i t e has distally a very short bristle
on the inside close to the exopodite. The end joint of the exopod i te has four bristles
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