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200—0 m.; 23. VI. 1902; temperature at 200 m., 5",25 C.: 1 juvenis; R. M. S. 237. S. A. E.,
PI. station 70 b, lat. 49° 56’ S., long. 49° 56’ W.; depth, 2700—0 m.; 27. VI. 1902; temperature
at 2700 m. and at the surface, + 1°,67 C. and 3°,40 C. resp. : 2 mature males, 3 mature females
and 1 juvenis; R. M. S. 238.
Distribution: — According to G. W. MÜLLER in the Atlantic, Indian and Pacific Oceans.
In the Atlantic (Antarctic Ocean) as far as lat. 65° S.
The specimens investigated by me were caught in the region of distribution previously
known.
Conchoecia isocheira G. W. Möller
Conchoeciaisocheira, G. W. Müller, 1906 a, p. 84; pi. XIV, ligs. 28 —31 ; pi. XV, figs. 30—33.
„ „ „ „ „ 1906 c, p. 4.
„ „ „ „ „ 1908, p. 70.
,, ,, ,, ,, ,, 1912, p. 77.
Description: — See G. W. MÜLLER, 1906 a, p. 84.
Supplementary description : — Male: —
Shell: — Length: According to G. W. Müller, 0,9 mm. The specimens investigated
by me were also of this length. Length : height about 1,7 : 1; length : breadth about 2,3 : 1.
Seen from the side it is of the type described by G. W. MÜLLER. Seen from
b e 1 o w it has its greatest width at about the middle, with uniformly and rather strongly curved
side contours, the anterior end rather narrowly rounded, with about a symmetrical rostrum,
the posterior end somewhat pointed and the anterior and posterior ends of the shell about the
same size; cf. the accompanying fig. 2, <$ = $. The shoulder vault is very weakly developed
and well rounded. The surface of the shell is bare or has only a few exceedingly
short hairs. Seen from inside : Selvage : This is of the same type as in C. rot undata
or else it is practically quite smooth-edged. The glands are as established by G. W. MÜLLER;
it is to be noted that the dorso-medial glands are quite absent both in males and females,
contrary to what is the case in C. rotundata, in which, though weak, they are founcl in the male,
and unlike in most other species of this genus. The medial glands along the posterior margin
of the shell are about similar to those of C. rotundata. There is no distinctly developed
hinge-socket or hinge-tooth at the posterior dorsal corner of the shell.
First antenna: — This is of the type described and reproduced by G. W. MÜLLER.
E-bristle: This has from seven to nine spines situated in a single row. Each of these spines
has distally a moderately large, oval, hyaline appendage (something like a suctorial organ;
cf. the accompanying figs. 3 and 4). The secondary bristles on the anterior side of this bristle
are like those of C. rotundata. The b- and d-bristles have a moderate number or rather few
exceedingly fine distally pointing spines at about the corresponding place to that of the spines
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