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F i f t h 1 i ni b : — Protopodite: The longer of the two tube-bristles on the
second endite always seems to be furnished with rather long and stiff secondary bristles at the
middle. Endo’podite: Very like that of C. oblonga. In exceptional cases there were in
the specimens investigated by me two, not one as is normal in this genus, tube-bristles dorsally
of the short, dorsal claw; one of these two tube-bristles was rather short. Exopodite: First
joint: This has two medio-ventral bristles, which are in most cases subequal and about as long
as the proximal height of this joint, both with short hairs. The proximo-ventral group of bristles
has three or four bristles in it; these vary somewhat in length, the longest often being about
as long as the medio-ventral ones, the shortest about half as long; one of the longest of these
bristles usually has long secondary bristles, the others usually have short hairs. The
disto-ventral group of bristles usually contains two or three bristles, all usually with short hairs, the
longest in most cases about as long as the medio-ventral bristles, the two others usually consid-
erably shorter and weaker. The dorso-lateral bristle is most frequently somewhat shorter
than in my fig. 27 of C. symmetrica and is furnished with long hairs; in one specimen
I observed on one fifth limb two such bristles situated close together. End joint: The middle
claw is in most cases somewhat longer relatively than in my fig. 27 of C. symmetrica-, the dorsal
bristle is about a third or a quarter shorter than the middle claw. Pilosity: The pro topodite
and the first exopodite joint are often furnished with sparse hairs.
S i X t h limb: — The two bristles of the endopodite most frequently have
short hairs. Exopodite: First joint: The ventral bristles are in most cases relatively
shorter than in my fig. 29 of C. symmetrica ; most or all of them have short hairs. One of the most
distal of these bristles is often absent. The dorso-lateral bristle of this joint usually has long
secondary bristles.
Penis (fig. 12): — This is somewhat S-shaped; its distal part is bent ven trally. Somewhat
distally of the middle it has from about four to six oblique transverse muscles, distally of which
there are no muscles. It has a moderately large and distally rounded copulatory appendage.
Furca: — There is no unpaired bristle behind the claws.
Rod-shaped organ: — The capitulum, which points forward, reaches with its
point to about the point of the first antenna and is about as long as the height of the second
joint of this limb; its shape is about the saine as in pl. XIII, fig. 20, U. W. MÜLLER, 1906 a;
cf. the adjoining fig. 14.
Upper lip: — The part between the combs on the postero-ventral edge of this
lip is in most cases of about the type reproduced in my fig. 37 of C. symmetrica, but slight
variation was found. The paragnates are of about the same type as in the species just
mentioned.
Female: —
Shell: — Length: G. W. Müller gives this (1906a) as: 1,1—2,1 mm. „die großen
Individuen über 1,9 ... . stammen aus der Arktis“ (the same author, 1912). The specimens
investigated by me had the following lengths: Skager Rak and Cattegat: 2,0—2,15 mm.;
Lofoten, 1,95—2,25 mm.; Arctic Ocean: 1,8—2,2 mm.; Atlantic Ocean: 1,15—1,6 mm.;
Antarctic Ocean: 1,5—1.85 mm. The females from both the Arctic (with Skager Rak and Catte-
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