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Material of
investigation.
Relation to
C. (V.) norvegica.
Parasites.
Of the bristles on the end joint the two middle ones, which are developed like claws, seem to
be somewhat more power fully armed than those of the species in question.
Maxilla: — This shows close agreement with the maxilla in C. (V.) norvegica. The
first endite of the protopodite has eleven, the second öve and the third five masticatory
bristles. Distally-posteriorly the first endopodite joint has three bristles; the end joint
has thirteen bristles; a few of the a-bristles have, however, some few rather strong secondary
teeth at the middle.
F i f t h 1 i m b : — Only the left limb of one sexually mature female was investigated
— This showed a very close agreement with the corresponding appendage in C. (V.) norvegica.
the only differences that were observed being that the main tooth of the first exopodite
joint was composed of eight, and not seven, constituent teeth, that the fourth exopodite joint
had only three bristles distally close to the inner edge and that the group of bristles situated
proximally of these bristles was represented by a single bristle. — It is to be noted that the
first endite of the protopodite was defective, so that I cannot give any information
about its structure in this species.
Six th limb: — This is very similar to the corresponding appendage in C. (V.)
norvegica, but the specimen investigated had, however, only seven to ten bristles on the end joint.
Seventh limb: — This is very similar to that of the preceding species. Cleaning
bristles: There were seven ventral and five or six dorsal bristles situated very close toge ther
distally; proximally of these there were six or seven ventral and from six to nine dorsal bristles
scattered irregularly. The single chitinous peg on the dorsal wall of the cavity dorsally of the
end comb was finely serrated distally.
Furca: — This is also very like that of the preceding species. It is to be noted that
in this species too, contrary to G. W. MÜLLER’s statement, the third claw is somewhat, though
only slightly, shortened and weakened.
Upper 1 i p, rod-shaped organ, lateral e y es: see G. W. MÜLLER’s
description.
Remarks: — As appears from the remarks on C. ( V.) norvegica, p. 265, the above
supple-mentary description is based on a sexually mature female, which was kindly sent to me by
Prof. G. W. Müller.
A comparison between the descriptions given above of this species and C. ( V.) norvegica
will show that we are dealing with two rather closely related species. Possibly they ought to
be denoted as representative forms in the Arctic and the Antarctic.
It may be pointed out in passing that, although both forms possess a parasite of the
genus Cyproniscus, we are concerned, all the same, with two well-defined species of this genus,
one infecting the arctic, the other the antarctic, species.
Distribution: — Antarctis: „Gausstation“ of the German South Polar
Expedition, 1901 —1903. Common, about 200 specimens were captured on several
occasions. (G. W. MÜLLER, 1908.)
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