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algae: 7 mature females, 1 mature male and 8 juvenes; R. M. S. 172. S-. A. E., no number
of the station, Grytviken; 22. Y. 1902; on an old root of Macrocystis: 3 mature females; R. M. S.
173. S. A. E., Station 28, mouth of Grytviken, lat. 54° 22’ S., long. 36° 28’ W.; 24. V. 1902;
depth, 12—15 m.; sand and algae: G mature females, 1 mature male and 3 larvae in the last
larval stage; R. M. S. 174 and 175. S. A. E., Station 33, Grytviken, lat. 54° 22’ S., long. 36° 28’ W. ;
30. V. 1902; depth 22 m.; clay with algae: one mature female; R. M. S. 176.
Type-specimen on slides in the collections of the R. M. S.
Asterope aberrata n. sp.
Description: ■— Female: —
Shell: -— Length, 1,65—1,71 mm.; length : height about 1,94 : 1; lengtli : breadth
about 2,43 : 1. Seen from the side (fig. 1) it is of a somewhat irregulär elliptical shape;
the greatest height is at about the middle; the anterior and posterior ends are both comparatively
low, the latter being somewhat, though only rather slightly, higher than the former. The dorsal
and ventral margins are rather evenly and moderately curved, with almost the same shape,
though the former is’somewhat, though only rather slightly, more strongly curved than the latter;
both are somewhat flattened anteriorly; they pass evenly int.o the anterior and posterior margins,
without any corners. The anterior end is boldly and evenly rounded, the posterior end is
somewhat prolonged and forms a broadly rounded corner at about half way up the shell. Seen
from b e n e a t h (fig. 2) the shell is narrowly oviform with its greatest breadth just behind
the middle; its posterior end is somewhat more broadly rounded than the anterior one and it
has evenly curved side-contours. Seen from inside: Medial bristles: On the rostrum
(fig. 3) there are a moderate number of moderately long or rather short bristles. A number
of these are arranged in a more or less distinct and rather dose row running about parallel to
and somewhat inside the anterior margin of the shell ; the others are scattered. In the incisur
there are on the posterior edge of the rostrum a moderate number of moderately long, scattered
bristles. In addition there is in the incisur a few scattered bristles and a close row of moderately
long bristles, running somewhat inside and about parallel to the ventral margin of the rostrum.
On the part just behind the incisur there are a moderate number of scattered bristles, most
of which are moderately long, some, especially those situated farthest in, more or less short.
Along the middle part of the ventral margin of the shell there are a moderate number of rather
short bristles, arranged in a distinct row running about parallel to and somewhat inside the margin
of the shell. This row of bristles becomes somewhat more dense posteriorly and at the same
time the bristles become somewhat longer; it continues along almost the whole of the
spine-bearing list, running about parallel to and somewhat inside the margin of the shell (tig. 4);
in its dorsal part it becomes more sparse than it is ventrally. The spine-bearing list has about
26—28 hyaline spines varying somewhat in size and a very sparse row of short bristles, usually
one bristle between each hyaline »pine; between a number of the hyaline spines, however, there
are sometimes no bristles. About parallel to and half way between the bristle-bearing listand
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