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Sub=Order I. Cypridiniformes
Gen. ,,C y p r i d i n e s“, H. MlLNE EDWARDS, 1838. p. 178.
,, Cypridina, H. Milne Edwards, 1840, p. 409.
Fam. Cypridinadae, \V. Baird, 1850 a, p. 170.
Sub-Fam. Cypridininae, J. D. Dana, 1852, p. 1281.
Fam. Cypridinidae, G. S. Brady, 1868 b, p. 462.
„ ,, G. W. Müller, 1894, p. 203.
,, Asteropidae + Fam. Cypridinidae -f- Fam. Rutidermatidae + Fam. Sarsiellidae,
G. S. Brady and A. M. Norman, 1896. pp. 628. 638, 673, 675.
,, Cypridinidae, G. W. MÜLLER, 1912, p. 7.
Diagnosis: — Shell: —- Has most often on the anterior border a more or less
well-developed rostral sinus, placed at or a little beneath, rarelv a little above, half the height of
the shell; its dorsal and ventral margins most often more or less convex; the hinge verv seldom
withteeth; within the free edge of the shell a greater or less number of medial bristles*;
the edges of the valves without or with eomparatively few glands; most often with a strong
incrustation of lime.
First antenna: — Originates rather deep down on the front. Strong, more or less
elongated, with 5—8 joints; first joint quite without bristles, is directed more or less upwards,
and together with the next joint forms a decided knee, open downwards. The original fifth
joint has, in the male always, in the females most often, distally at the back a powerful sensory
bristle, always (?) furnished with sensory filaments, termed ,,the sensory bristle of the fifth
joint“, but apart from this this joint has no bristles at all. This limb is principally a sensory
and locomotory organ, as an organ of locomotion, however, it never co-operates in swimming.
Second ant enna: — The protopodite is situated on the side of the upper
lip. With a rather narrow base, very movably united to the body; large, relatively high,
heart-or pear-shaped flattened at the sides, with very powerful musculation, unjointed, without
any obvious traces of the boundary between the original joints; sometimes with a short bristle
* These medial bristles prevent foreign partieles from entering the cavity of the shell but allow a free exit,
being, at least the outer ones, almost always directed outwards.
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