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detailed description of the genus; only a short diagnosis could be given. It is thus probable
that a number of the characters that are included in the description of the species given below
are characters of the genus as well.
For the scope of this genus and the contrast between G. W. Müller’s and my ideas
about it see above, p. 441 under the remark on the familv Asteropidae.
Type species: Cydasterope Hendersoni, G. S. Braüy, 1897.
Cydasterope fascigera G. S. Brady.
Cydasterope fascigera, G. S. BRADY, 1902 a, p. 181, pi. XXI, figs. 20—31.
Asterope „ G. W. Müller, 1912, p. 44.
Description: — Cf. G. S. BRADY, loc. cit.
Male: —
Shell : —Length, 5,8—6 mm.; length : height about 1,75 : 1; length : breadth about
1,8 : 1. Seen from the side (fig. 1) it is rather elongated, sub-ovate, with the posterior
part somewhat larger than the anterior part and the greatest height just behind the middle.
The dorsal and ventral margins have about the same shape; they are moderately and somewhat
irregularly curvecl and somewhat flattened anteriorly. They pass without anv corners into the
boldly and uniformly rounded anterior margin. The latter has about the same shape on both
the valves and is not unsymmetrical, as G. S. Brady has represented it in pl. XXI, tig. 20. The
rostral incisur is situated at about half the height of the shell ; the ventral corner of the rostrum
is almost rectangular, not at all or very slightly rounded. The posterior margin of the shell
forms, somewhat dorsally of half the height of the shell, a rather sharply marked corner, which
forms an obtuse angle and is only weakly rounded; it is uncertain whetlier this is found on both
valves, as this part of the right valve was somewhat damaged in the only specimen that was at
my disposai. Both dorsally and ventrally of this corner the posterior margin of the shell is
almost straight; it is bounded from the ventral margin by a weak, broadly rounded, scarcely
perceptible corner or it passes evenly into it; its passage into the dorsal margin is marked by
a slight sinuation. „Seen from above the outline is elliptical, with broad, slightly rounded
or subtruncate extremities; lateral margins gently and evenly arcuate, greatest width situated
in the middle“ (G. S. Brady, p. 181, pi. XXI, fig. 21). The surface of the shell
is almost quite srnooth, with only small, rounded, shallow foveolae, chiefly situated on the
anterior part of the shell. There are scarcely any biistles. The wreath of hair round the posterior
partof the shell is dense; these hairs are comparati vely long and coarse. Seen fromwithin
(fig. 2): Right valve: The ventral lip of the incisur forms a heel-shaped part, which
projects rather decidedly and is eut off obliquely dorsally. The antero-ventral part of the
rostrum also projects like a heel. Somewhat inside and running about parallel to the anterior
part of the dorsal and the dorsal part of the anterior margin of the shell there is a dense
series of very small, rounded and strongly refractive formations resembling a string of pearls.
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