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First antenna: —- The sensory bristle of the fifth joint has seven sensorial
filaments. Its end joint has seven bristles, as botli the d- and the e-bristle are well developed (the
d-bristle is, however, distinctly weaker than the e-bristle).
Mand ibi e: — Protopodite: First joint: The rod-shaped process of the endite has
three or four short, powerful spines distally. Second joint: The backward pointing process:
The triaena bristles have relätively numerous (3—15 pairs) secondary spines proximally of the
distal pair of spines. Two dwarf bristles are developed on this process. On the middle
of the dorsal side of this joint there are a number of bristles. Endopodite: The second
joint has from two to four proximal bristles and one long, narrow bristle, with short,
fine hairs, between the b- and c- main bristles.
S e v e n t h 1 i m b: — This has rather numerous cleaning bristles. The teeth of the
end combs are finely and evenlv pectinated.
The médian e y e is bare.
The m a le is unknown.
To this group belong — at least with complete certainty — only two of ail the species so
far described; these are described by me below:
A. quinquesetae and
,, spinifera.
For A. australis, G. S. BRADY, 1890, cf. remark under A. spinifera, p. 483 below.
Midlen group:
Female: — Shell: — Seen from the side, this is rather high and short, somewhat
pear-shaped, with the posterior part rather strikingly larger than the anterior one.
First antenna: — The sensory bristle of the fifth joint has six sensorial filaments.
Its end joint has only six bristles, as of the d- and e-bristles only the latter is well developed,
the former being represented by a very small verruciform process.
M an dible: — Protopodite: First joint: The rod-shaped process of the endite
is furnished distally with three short, fine points. Second joint: The triaena bristles of the
backward pointing process have rather few (from one to six pairs) of secondary spines
proximally of the distal pair of spines. Only one dwarf bristle is developed on this
process. There are no bristles at all on the middle of the dorsal side of this joint. Endopodite:
The second joint lias one proximal bristle and one long, narrow bristle, with short, fine hairs,
between the b- and c-main bristles.
S e v e n t h 1 i m b : — This has twelve cleaning bristles, six of which are situated near
the point of the limb, three on each side and six somewhat proximally of these. The teeth of
the end combs are variously equipped, the most distal on es having considerably stronger and
fewer secondary teeth than the proximal ones.
The m e d i a n e y e has short, fine hairs.
The males are practically unknown. According to a statement of G. S. Bhady’s,
however, at least one species has abundant sensorial filaments on the sensory bristle of the fifth
joint of the first antenna.
The following species of those investigated bv me belong to this group:
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