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C. H. Ostenfeld, 1906, p. 97.
A. K. Linko, 1907, p. 195.
C. H. Ostenfeld and C. Wesenberg-Lund, 1909, p. 114.
A. M. Norman and G. S. Brady, 1909, p. 359.
G. O. Sars, 1909, p. 40.
C. Apstein, 1911. p. 168, PI. XXIII.
G. W. Müller, 1912, p. 32.
globosus, K. StEPHENSEN, 1912, p. 551.
brenda, ,, ,, 1913, p. 353.
,, ,, ,. 1917, p. 306.
Description: — Female: —
Shell: — Length 2,3—3,1 mm. ; onlyspecimens from the most northern locales, Greenland,
Spitzbergen etc. have shells as long as 2,9—3,1 mm.; the specimens from the more Southern
locales are, on the average, rather considerably shorter; thus, for instance, the specimens from
Skager Rak that were investigated by me were, on an average, only about 2,4—2,6 mm.
Length : height, about 1,4 : 1; length : breadth about 1,75 : 1. Seen from the side,
(tig. 3) it has a somewhat varying shape, though the variation is rather slight. The greatest height
is at about the middle. The dorsal margin is rather weakly arched; this arching is, however,
somewhat different in differentindividuals; it is somewhat sloping posteriorly and with broadly rounded
corners passes over into the rather steeply sloping anterior and posterior margins. The ventral
margin is uniformly and moderately strongly curved and is somewhat pouting just behind the
incisur. The posterior part of the shell forms a rather slightly projecting and somewhat rounded
corner somewhat ventrally of half the height of the shell; above this corner the posterior margin
of the shell is straight or is only slightly arcuated. The rostrum has a more or less rounded
anterior corner, projecting in most cases almost at a right angle; its ventral corner is rather
pointed and has a small spine-like process. The rostral incisur is rather deep and narrow and
is defuied from the ventral margin by a weak protubérance. Seen from b e 1 o w the shell
is oval, with its greatest breadth at about the middle, the anterior and posterior ends of about
the same shape, the side contours almost uniformly curved (about the same as in the
accom-panying figure 2 of the male). The surface of the shell has no marked protubérances
except one weak ridge behind the rostral incisur, continuing on to the above-mentioned small
protubérance that forms a boundary between the ventral margin of the shell and the incisur,
and the small spine on the point of the rostrum. It is covered with numerous rounded cavities,
situated fairly close together; these are very often difficult to discern, especially on the specimens
from the more southerly locales, and sometimes they even seem to be quite absent. The whole
surface has scattered short, sti ff bristles, situated rather close together; among these there are
also a few somewhat longer bristles, distinguished byT the faet that from a short rather thick
basal part they taper to a fine point (these bristles are, however, not quite so long as those on
the shell of the males), see fig. 4. The pores of the surface are very difficult to discern with
certainty in most cases; they are rather small and numerous. Seen from inside: Medial
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