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Sub-Order II. Halocypriformes
Gen. Conchoecia, J. D. Dana, 1849, p. 51.
Sub-Fam. Halocyprinae, J. D. Dana, 1852, p. 1281.
Fam. Conchoeciadae, G. 0. SARS, 1865, p. 114.
,, „der Conchoecia den oder Halocypride n“, C. Claus, 1874 b, p. 7.
,, Conchoeciidae, G. O. Sars, 1887, p. 64 (236).
,, Halocypridae, C. CLAUS, 1888, p. 152.
,, „ G. W. Müller, 1894, p. 221.
„ „ G. S. Brady and A. M. Norman, 1896, p. 682.
„ „ G. W. Müller, 1912, p. 53.
Diagnosis: — This sub-order comprises only a single familv, the familv Halocypridae.
For the diagnosis of the sub-order I refer the reader to the diagnosis of this family given below.
%
Family Halocypridae.
Synonyms: — See sub-order Halocypriformes.
Diagnosis: — Shell: — There is in most cases a distinctly developed rostral incisur
on the anterior edge. The dorsal margin is more or less straight, the ventral margin is in most
cases more or less convex or straight, less often slightly concave. The posterior part of the shell
is not siphon-shaped, the posterior margins of the two valves are, on the contra ry, here situated
close to or almost close to each other when the shell is closed. The valves are joined along less
than half the periphery; the joined edges of the hinge never have any teeth. Mithin the free
margin tliere is in most cases a very small number (sometimes even none or almost none) of
medial bristles. There is only slight calcification (the preserved material is most frequently
soft because of the more or less complete solution of the lime). Moderately large or rather
small forms.
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