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Conchoecia Haddoni G. S. Brady and A. M. Norman.
Conchoecia Haddoni, G. S. BRADY and A. M. Norman, 1896; p. 690; pl. LXIY, figs. 6—16.
,, ,, G. W. Müller, 1901, p. 9; fig. 17 (= a reproduction of the original
description).
„ „ P. T. CLEVE, 1905, p. 130.
., G. W. Müller, 1906 a, p. 89; pl. XVIII, figs. 1—10.
,, ,, V. VÂVRA, 1906, p. 49; pl. IV, figs. 65—75.
„ „ G. W. Müller, 1908, p. 70.
„ „ G. H. Fowler, 1909, pp. 235. 264. 287 ; pl. XVIII. XIX, figs. 73—89.
„ „ C. H. Ostenfeld and C. Wesenberg-Lund, 1909, p. 113.
„ „ G. W. Müller, 1912, p. 78.
Description: — See G. W. MÜLLER, 1906 a, p. 89 and V. VÂVRA, 1906, p. 49.
Supplementary description: — Male: —
Shell: — Length: G. S. Brady and A. M. NORMAN give this as 2,55 mm.
G. AV. Müller, 1906 a says: „Die Tiere scheinen sich ziemlich scharf in eine kleinere nördliche
Rasse ($ bis 2,6, <$ nur bis 1,9) und eine größere südliche Rasse ($ 2,6—2,95, d 2,2—2,5) zu
sondern“; the former one would be found in the north, the latter in the south hemisphere.
The total amount of variation for the length of the shell in the males would be 1,85—2,5 mm.
This division is obviously incorrect; the male investigated bv G. S. Brady and A. M. Norman,
which was caught off the coast oflreland, measured2,55 mm., as has already beeil pointed out,
i. e. more than G. AV. MUller’s Southern specimens; in addition V. VÂVRA gives a length of
2,4—2,5 mm. for northern specimens; G. H. Fowler states 2,1 mm. The specimens investigated
by me measured 2,3—2,6 mm. Length : height about 2 : 1. Length : breadth about 2,3 : 1.
Seen from the side the shell has about the type reproduced by G. S. BRADY and
A. M. NORMAN; see the accompanying fig. 1. Seen from b e 1 o w it has its greatest width
at about the middle and the anterior part is somewhat larger than the posterior part.
The side contours are somewhat concave just behind the middle but apart from this they are
uniformly curved. The anterior end is broadly rounded, with an almost symmetrical rostrum,
the posterior end is somewhat pointed or rather narrowly rounded; cf. the accompanying fig. 2.
The shoulder vault is rather well developed and well rounded. The surface of the shell
is bare. Seen from inside: Selvage: This is either smootli-edged or finely serrulated
on the rostrum and has no spines of any great size. It is smooth-edged along the anterior margin
of the shell and the anterior half of the ventral margin; along the posterior half of the ventral
margin of the shell it is finely serrulated and along the ventral half of the posterior margin of the
shell it is eoarsely and irregularly serrulated. The glands are of the type described by G. W.
Müller. The medial glands along the posterior margin of the shell are rather large; most
of them have a single exit; their exits are arranged in a rather distinct row running about half
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