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C. (Vargula) megalops G. 0. Sars
Cypridina megalops, G. O. Saks, 1872. p. 278.
„ „ G. S. Brady and A. M. Norman , 1896, p. 649; pi. L1V, figs. 5, 6.
„ „ G. W. Müller, 1912, p. 15.
Description: — F e ni a 1 e: —
Length, 3 mm. Length : height, about 1,43 : 1; lengtli : breadth, about 1,85 : 1.
Seen from the side (fig. 1) it is broadly egg-shaped with the greatest height situated
rather considerably behind the middle and the posterior part rather strildngly larger than the
anterior one. The dorsal margin is rather boldly arched, its arcuation being somewhat more
pronounced posteriorly than it is anteriorly, and, like the ventral margin, which is uniformly
and somewhat more slightly arched, joining the anterior and posterior margins without decided
corners. The rostrum is well rounded anteriorly or has a broadly rounded and rather weakly
developed anterior corner; its ventral corner is rather well pointed. The rostral incisur is deep
and narrow. The posterior part of the shell is broadly rounded and has a weakly developed and
broadly rounded posterior corner at about half the height of the shell. Seen from b e 1 o w
(fig. 2) the shell is oviform with its sides evenly arched and its greatest breadth situated somewhat
behind the middle; the anterior end is somewhat more narrowly rounded than the posterior one.
The surface of the shell is quite smooth except in the neighbourhood of the anterior
margin of the shell, where it appears to have small, rounded cavities. The bristles of the surface
seem practically to be entirely lacking. The pores of the surface are, on the contrary, very
numerous and rather large and striking. Seen from inside (fig. 3): Medial bristles:
On the rostrum there is a fairly close row of rather short and in most cases bifurcated bristles
running obliquely upwards and forwards. The place on which the ventral ones of these bristles
are fixed does not form a verruciform swelling. Apart from these bristles there are only a few
found on the rostrum. Apart from the two bristles situated close to each other near the inner
margin of the incisur there is generally only a single bristle inside the incisur; this bristle is
short and is situated somewhat dorsally of the two just mentioned. Along the anterior part
of the list there is a moderate number of bristles, mostly bifurcated, situated most closely
just behind the rostral incisur and becoming more and more sparse posteriorly, but observable,
however, along the whole ventral side of the shell. All the médial bristles are bare or almost
bare. The list within the posterior margin of the shell is somewhat wider than it is anteriorly and
has no other appendages except a comparatively few short, simple bristles, whieh are difficult
to distinguish. On the part of the shell between the list and the margin there seems as a rule to be
practically no bristles. The selvage is wide, extending rather considerably beyond the edge of
the shell both along the anterior and posterior margins of the rostral incisur — the incisur is
quite filled with it — as well as along the anterior edge of the rostrum. Along the whole ventral
side of the shell the selvage also is comparatively wide — although considerably narrower than
it is anteriorly — extending somewhat beyond the edge of the shell. It is finely and fairly
uniformly cross-striated. The shell is rather strongly calciferous, but thin and fragile.
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