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Description : — F e m a 1 e: —
Shell: — Length, 6.3—6,8 mm. Length : height, about 1,55 : 1; length : breadth,
about 2,1 : 1. Seen from the s i d e (fig. 1) it is moderately elongated with its greatest
height somewhat in front of the middle and the anterior part somewhat larger than the posterior
one. The dorsal margin is rather strongly arched, either uniformly or often somewhat flattened
at the middle, joining the anterior and the posterior margins without any indication of corners.
The ventral margin is uniformly arched with a rather décidée! bulge anteriorlv, somewhat more
stronglv arched at this part than the dorsal margin; joining without any sign of a corner the
posterior margin, together with which it forms a slightly convex, straight, or sometimes even
a very slightly concave line. The posterior part of the shell is drawn out in to a sharply projeeting,
acute angled, but well rounded corner at or a little below half the height of the shell. The
rostrum has a rather strongly projeeting but broadly rounded anterior corner; its ventral corner
is rather pointed. Seen from the side the rostral incisur is often of rather a varying type, the
variations being obviously caused by the flexibility of the shell; yet it was not found to be so
deep as it is shown in pl. V, fig. 1. G. W. MÜLLER, 1906 a. Seen from a b o v e (fig. 2),
the shell is broadly lentiform with its greatest width a little in front of the middle and with
uniformly curved side contours, which are, however, somewhat concave in front of the lateral
eyes. The front and back ends are rather well pointed. The surface of the shell
is quite smooth without any sculpture and quite without bristles. The pores of the surface
are difficult to observe with certainty. Seen from with in (fig. 3): Medial bristles:
Near the ventral point of the rostrum there is a verruciform swelling, projeeting rather strongly
and directed inwards and downwards; it is furnished along the anterior side with a dense row
of about 15 te 20 rather long and powerful and smooth bristles. Basally on this swelling there
is a single tube-like bristle, thick but evidently very flexible; in some rare cases two of these
were present. Dorsally of this swelling there is a row of bristles running upwards, of the same
type as the first-mentioned bristles : the number of bristles in this row varies, from six to as
many as sixteen have been observed. Apart from these just mentioned the rostrum is usually
quite without medial bristles, but sometimes, however, one or a few short, scattered bristles
may be found. The two bristles dose to the inner margin of the incisur are of about the same
type and size as the bristles in the row mentioned above. Above them, about half-way between
the joining line and the margin of the shell or somewhat nearer the latter, there is a single bristle,
quite short and rather weak. Besicles these three bristles a few other short bristles are sometimes
found inside the incisur. The list is usually quite without bristles along the whole ventral side
of the shell even just behind the rostral incisur, where, in most forms of this family — in all that
are described in this work — bristles are to be found. Posteriorlv it lias, however, a few bristles.
1 he posterior part of the list, which is somewhat broader than the anterior one, is also
cliaracterized by pore-like formations, such as are reproduced on p. 228 of this work for
C. (Doloria) levis, but 1 believe I have ascertained with certainty, with ReichERT’s ocular 4,
l,Ll’lz immers. Via, that these do not end in a short bristle. (The list appears on the whole
to be very like the one described for the species just mentioned, but lias, however, still fewer
bristles than this.) On the part between the list and the ventral and posterior margins of the
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