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A. Miilleri.
,, ,, var. long iseta.
,, Ohlini.
The form A. curta deseri bed below also seems to be closely related to this group. In some
characters, however, it occupies a special position:
Fe male: — First antenna: — On the anterior side of the thirrl joint there are
only five bristles (six in the former species). M a n d i b 1 e: — The backward pointing process
on the second pro topodite joint has two dwarf bristles. The seventh 1 i m b has more than
twelve bristles; the teeth of the end combs are evenly and finely pectinated. Male: — The
first antenna has only six sensoria! filaments on the sensory bristle of the fifth joint.
For the relation to this group of the following species not investigated by me see pp. 488—-490,
the remark under A. Mullen: Cypridina teres, A. M. Norman, 1861, C y lindr oleberis t er es, G. fi. Bhad’i .
1868 b. Asterope oblonga och ovalis, C. Cl.AUS, 1876. Cylindroléberis teres, G. \Y. MÜLLER, 1894,
Asterope teres, G. S. Br.ADY and A. M. NORM AN, 1896 and A. oculata, G. S. BRADY, 1902 a.
A. glacialis is very closely connected to A. curta; cf. the remark under the latter species.
Gr i> ti aldi group:
Female: — Shell: — Seen from the side it is more or less elongated, with the
posterior and anterior parts of about the same height.
First antenna: — The sensory bristle of the fifth joint has seven sensorial
filaments. Its end joint has only six bristles, as of the d- and e-bristles only the latter is well
deve-loped, the d-bristle being represented only by a very small verruciform process.
Mandi ble: — Protopodite: First joint: The rod-shaped process of the endite
has three short powerful spines distally. Second joint: The backward pointing process: The
triaena bristles have rather few (from two to five pairs) of secondary spines proximallv of
the distal pair. Two dwarf bristles are developed on this process. On the middle of the
dorsal side of this joint there is usually one, but sometimes no or two bristles. Endopodite:
The second joint has one proximal bristle and has no long, narrow bristle, with fine, short
hairs, between the main bristles b and c.
Seventh lim b: — This has twelve cleaning bristles, six of whieh are situated near
the point of the limb, three on each side, and six somewhat proximallv of these, three on each
side. The teeth of the end combs are evenly and finely pectinated.
The m e cl i a n e y e is bare.
Male: The first antenna has numerous sensorial filaments on the sensory bristle
oi the fifth joint. For other examples of dimorphism see the descriptions of the species.
The following species of those investigated by me belong to this group:
A. Gr imaldi
„ „ var. vicina
,, oculata
„ norvegica.
A. abyssicola is also verv closely related to this group. It differes from it, however, in
a number of characters: Man dible: — The second endopodite joint has two proximal
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