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Conchoecia obtusata, C. H. OSTENFELD, 1906, p. 96.
„ „ V. VÂVRA, 1906, p. 36; pi. I, figs. 13—19.
„ „ E. KOEFOED, 1907, pp. 150, 151, 156, 202.
„ „ C. H. Ostenfeld and C. Wesenberg-Llnd, 1909, p. 113.
„ „ C. APSTEIN, 1911, p. 166; pi. XXIII.
„ „ E. JÖRGENSEN, 1912, pp. 14, 16.
„ „ G. W. Müller, 1912, p. 74.
„ „ K. StePHENSEN, 1913, p. 354.
Description: — See G. W. MÜLLER, 1901, p. 5, figs. 8—10 and V. VAvra, 1906, p. 36;
pi. I, figs. 13—19.
Supplementary description. — Male: —
Shell: — Lengtli: According to G. W. MÜLLER, 1901 and 1912, 1,1—1,2 mm.;
according to V. Yâvra, 1,2 mm. The specimens investigated by me measured 1,15—1,35 mm.
Length : height about 2:1; length : breadth about 2,5 : 1. Seen from the side it
is of about the type reproduced by G. W. MÜLLER, 1901, fig. 8; in most cases, however, it has
a straighter dorsal margin and the anterior part of the shell dominâtes somewhat less over
the posterior part; cf. the accompanying fig. 1. Seen from below (fig. 3) it has its
greatest width at or in most cases somewhat behind the middle. Its side contours are either
rather evenly curved or else they are somewhat flattened at the middle. The posterior part
of the shell, which sometimes dominâtes at least to some extent, though only rather slightly,
over the anterior part, is somewhat pointed, the anterior part is somewhat more rounded and
has an almost symmetrical rostrum. The shoulder vault is moderately well developed and well
rounded. The surface of the shell is almost or quite bare. Sculpture: There is a weak concentric
striation, in most cases rather diffieult to observe. Seen from inside: Selvage: On the
rostrum it either has an even edge or else it is irregularly serrulated. Along the anterior margin
of the shell and the anterior part of the ventral margin it has in most cases an exceedingly fine
serrulation; along the posterior part of the ventral margin it has a fine semdation; the serrulation
within the posterior margin of the shell is most frequently rather sparse. The part on the rostrum
has no long bristle-like process. The unsymmetrical glands have their exits at the usual place.
There are no lateral corner glands. Ventrally of the incisur there emerge some glands, which
are small or large according to the physiologica! condition; cf. V. VÂVRA, 1906, pi. I, fig. 12.
The medial glands along the posterior margin of the shell are moderately large; their exits are
always simple, arranged in a rather distinct row running a short distance inside the margin of
the shell and not joined by any distinct list. The junction between the lamellae is rather wide
at the rostral incisur; dorsally of the incisur the lamellae are joined at a rather large rounded
part; cf. the accompanying fig. 1. At the posterior dorsal corner of the shell there is a rather
well developed hinge-socket and hinge-tootk of an oblong oval shape.
First antenna: — The b-, d- and e-bristles are either subequal or else the e-bristle
is somewhat longer than the two others; they are about oue and a third or one and a half times
Zoolog, bidrag, Uppaala. Suppl.-Bd I. Ni
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