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Brooks’s law. Remark: — As will be seen below, I found, besides mature females, three female larvae
as well of this species from station no. 34 of the Swedish „Antarctic“ Expedition.
Two of these larvae were 2,44—2,45 mm. long, the third was only 1,95 mm. If we assume — and
the assumption is supported by anatomical investigation — that these two classes of length
represent the two oldest larval stages, we obtain, by using BROOKS’s law, a coefficient of growth
of 1,25 (2,44 : 1,95 — 1,25). If 2,44 mm. then is multiplied by 1,25 we get 3,05 mm., a value
which thus coincides with the length of the mature female.
Habitat: — South Georgia: S. A. E., Station 34, ofï the mouth of Cumberland
Bay, lat. 54u 11’ S., long. 36° 18’ W. (type -1 o c a 1 i t y); 5. VI. 1902; depth, 252—310 m.;
grey clay with scattered stones; temperature at the bottom, -f- 1.45° C: 4 mature females and
3 juvenes; R. M. S. 162.
Type specimen on slides in the collections of the R. M. S.
Asterope spinifera n. sp.
Description: — Female: —
Shell: — Length 2,55—2,6 mm.; length : height about 1,5 : 1; length : breadth about
1,7 : 1. Seen from the side (fig. 1) it is of about the same type as the shell of the
preeed-ing species, from which it differs chie fly by having the posterior part dominating over the
anterior one in a somewhat more striking way, by the dorsal and ventral margins being somewhat
more strongly curved and by the rostral incisur being situated somewhat more dorsallv. Seen
from beneath (fig. 2) it is also of about the same type as the shell of the species just
men-tioned, but is somewhat broader comparati vely. Seen from within: Medial bristles:
Parallel to and somewhat within the anterior margin of the shell there is on the rostrum a distinct,
moderately close, row of moderately long, stiff bristles. Within this row there are on the rostrum,
in the incisur and on the part just behind the latter rather numerous stiff bristles, all scattered,
most of them moderately long, a number, especially amongst those situated farthest in, more
or less short. Along the middle part of the ventral margin of the shell there are a moderate
number or rather numerous moderately long or rather short, stiff bristles, either scattered
or arranged in a more or less distinct row running somewhat within the margin of the shell.
From a point somewhat in front of the ventral boundary of the spine-bearing list this row of
bristles is continued by a very close, distinct row of moderately long, stiff bristles, running about
parallel to and somewhat within the margin of the shell up to about half the height of the shell,
from where it is continued by a considerably more sparse row of rather short and weak bristles,
which continue right up to the dorsal boundary of the spine-bearing list (fig. 3). Apart from
these bristles there are usually no medial bristles on the part between the posterior margin of
the shell and the spine-bearing list. The spine-bearing list has not an undulated edge and is
provided with 35—38 hyaline spines of somewhat varying sizes and a very close row of rather
short bristles of somewhat different lengths; about fom’ to six bristles were observed for each
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