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of the shell and partly because it was caught in a region which, from the point of view of its
plankton-fauna, presumably agrees very closely with that from which the male described by
G. W. Müller came. Of course this identification is not quite certain.
Habitat: — Antarctic Ocean:
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, -f- 1.67" C. and .‘1 40° C. resp. : 1 mature female.
On slides in the collections of R. M. S.
Distribution : — A single male was captured by the ,,G a u s s’1 at lut. 35° S. and
long. 2" E.
Serrulata group n.
(Pseudoconchoecia C. Claus)
Of the species of this genus hitherto described the one dealt with below seems to be the
only one that can be referred with en tire certainty to this group.
C. serrulata was provisionally placed by G. W. MULLER, 1906 a, in the Loricata group.
As far as I can see, this assignment was based practically exclusively on the agreement with
regard to the positions of the compound glands. To this character, however, no great systematic
importance is to be attached, as the positions of these glands do not differ more or less decidedlv
from what is the case in most of the other species of this genus, but are, on the contrarv, very
near to what one might call the normal for this genus. (Cf., for instance, C. rhynchena G. \V.
MULLER and C. plinthina G. \Y. Müller, etc.) On the other hånd the differences between
C. serrulata and C. loricata C. CLAUS — C. ctenophora G. \V. MULLER, the two species that form
the Loricata group, are not inconsiderable. By including C. serrulata in the Loricata group
the systematic unity of this group is lessened to a very great extent. It seemed to me accordingly
inconvénient to follow this procedure of G. W. MüLLER’s and so I have distinguished G. serrulata
as a representative of a special group.
Whether C. concentrica G. W. MULLER is closely related to C. serrulata I cannot sav.
It does not seem to me impossible. G. W. MÜLLER writes as follows with regard to this species
(1906 b, p. 11): ,,Ich vermag keine deutlichen verwandtschaftlichen Beziehungen zu einer der
bekannten Arten zu erkennen; manche Charactere sprechen für eine Verwandtschaft mit
C. serrulata.“
Conchoecia serrulata C. Claus.
Conchoecia serrulata, C. CLAUS, 1874 a, p. 176.
,, ,, ,, ,, 1874 b, p. 6; pi. I, ligs. 2—7, 9, 10; pl. II, figs. 12. 13, 17. 19.
Halocypris atlantica, G. S. Brady, 1880, p. 164; pl. XL; pl. XLT, figs. 11. 12.
Pseudoconchoecia serrulata. C. Claus, 1890, p. 20.
Zoolog, bidrag, Uppsala. Suppl.-Bd. I. *S6
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