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of the unsymmetrical glands. The careful investigation of the two forms dealt with below that
I carried out afîords decided evidence that these two at least are verv closelv related to each
other. Presumably the whole group is quite a natural one.
Conchoecia rotundata G. W. Müller.
Comhoecia rotundata*, G. W. MÜLLER, 1890 a, p. ’275; pi. XXVIII, 1ms. 41—13;
pi. XXIX, hg. 44.
„ „ „ .. 1906 a, p. 83: pi. XVII, figs. 23—34.
,, ,, „ „ .. 1906 b, p. 4.
,, -, .. 1908. p. 69.
.. ., .. 1912, p. 77.
? * •• (part?), G. H. Foui EK, 1909, pp. 249. 273, 293; pi. XXIII and
XXIV, figs. 205—224.
Description: —See G. W . Müller, 1890 a, p. 275. 1906 a, p. 83 and G. H. FOWLER, loc\ cit.
Supplementärt/ description: — Male: —
Shell: — Length: According to G. V. Mi l.i.i l.. lS90a: 1,15 mm.; the sanie author
writes on this point (1906 a): .. : imd 3 o.S—1,75 mm., die der Antarktis durchweg durch Größe
(1,4—1,75 mm) vor denen der gemäßigten und warmen Zonen (0,8—1.4 mm) ausgezeichnet“;
Gr. H. Fou ler, 0,75—1,0 mm. Thespecimens investigäted by memeasnred 1.45—1.6 mm. Length :
height (inmy specimens)about 2 : 1 : length :breadthabout2,2 :1. Seen from the side the
shells of all the specimens from the Antarctic Ocean investigäted by me were of about the type
reproduced in the accompanving fig. 1, i. e. they agreed fairlv well with pl. XVII. fig. 26. G. W.
Müller, 1906 a (= $) and with G. H. FOWLER’s fig. 205. For this character see p. 657 below.
Seen from b e n e a t h (see the accompanving fig. 2) it has its greatest width at or just
in front of the middle and the anterior part of the shell is in most cases somewhat larger than the
posterior part; it has fairlv uniformly curved side contours, is rather broadly rounded anteriorly.
has an almost symmetrical rostrum and is somewhat pointed or narrowlv rounded posteriorly.
The shoulder vault is weakly developed and rounded. The surface of the shell is
bare or has on ly a few very short hairs. Seen from inside: Selvage: This is comparatively
narrow, in most cases it has a whole margin on the rostrum and along the anterior margin of
the shell and the anterior half of the ventral margin of the shell and is exceedingly finely
serru-lated posteriorly. The selvage has no spine-like process on the rostrum. The glands are as
stated by G. \V. MÜLLER, 1906 a. The dorso-medial glands are somewhat weakly developed.
The glands along the posterior margin of the shell are also rather weakly developed: tliey have
their simple exits near the margin of the shell. There is no distinct ly developed hinge-socket
or hinge-tooth at the posterior dorsal edge of the shell.
* By a misprinl: rodunlala.
Zoolog, bidrag, Uppsala. Suppl.-Bd. 1
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