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Is this species a
natural unit?
Synonyms.
as in pl. XXVIII, fig. 42, G. W. MÜLLER, 1890 a (cf. the accompanying fig. 3), i. e. of the same
elongated type as that of the male, but with the posterior part of the shell dominating somewhat
more over the anterior part. In other respects it was about the same as that of the male.
First antenna: — This is relatively short with a scarcely perceptible boundary
between the first and second joints. The second joint has no bristle. The e-bristle is about
one and a half or twice as long as this limb; distally on the proximal third of its anterior side
it has rather sparse, short, fine hairs; it is
not sword-shaped distally. The a-, b-,
c-and d-bristles are subequal and about
half as long as the e-bristle. There are
yellowish-brown pigment corpuscles, at
least in some cases, in the proximal part
of this limb. Ail the joints are bare.
S e c o n d antenna: — The
protopodite is only slightly weaker
than in the male. The proportion
between the length of the protopodite and
that of the exopodite is about the
same as in the male. Endopodite:
This has two joints, the original boundary
between the second and third joint having
quite disappeared. The f-, g-, h-, i- and
j-bristles are subequal and are about as long as or somewhat longer than half the length of
the protopodite; they are all bare and without any shafts. There is an extremely small
papilla (scarcely perceptible with Reichert’s ocular 4 and Leitz’s immersion V12) between
the h- and i-bristles. One of the c- and d-bristles is developed, at least in some cases; it is
very short, only about as long as the proximal width of, for instance, the f-bristle (is this
bristle’s absence secondary?). Pilosity: The second endopodite joint is bare.
S i X t h limb: — Endopodite: ( )ne of the two bristles is in most cases furnished
with short hairs. Exopodite: The first joint has no dorso-distal bristle; the other bristles varv
somewhat in length; they are often of the same relative lengths as in my fig. 30 of C. symmetrica.
Rod-shaped organ: — The point of the shaft reaches about as far in front of
the point of the first antenna as the length of the capitulum. The capitulum is somewhat
more than half the length of the first antenna; it varies in shape; it was fourni to be of about
the same types as are drawn by G. W. MÜLLER, 1906 a, pl. XVII, figs. 30—33.
Fig. CXXI1I. — Cnnchoecia rotundata G. W. Müller, q.
-15. Postero-ventral part.of the upper lip seen from below: 567 X.
(The specimen from stalion 64 b.)
Remarks: — Is this species, such as it is taken in the present work, a unit from a systematic
point of view? This is a problem at present extremely difficult to decide.
In the original description, which is worked out from „wenige Individuen“ caught at
a depth of 1000—4000 metres at about the equator in the Pacific Océan (lat. 100°—120° W.),
G. W. MÜli 42R gives the following information:
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