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Description: — See G. W. MÜLLER, 1906 a, p. 117.
Supplementary description: — Male: —
Shell: — Length: According to G. W. MÜLLER 3,7—1,1 mm.; my spécimens measured
4,0—4,25 mm. Length : height about 2,1 : 1; length : breadth about 2,4 : 1. Se e n i r o m
t h e side (see fig. 1) it is of about the same type as in C. plinthina G. W. MÜLLER. It
differs from this in the folio wing respects. The anterior part of the dorsal margin is partly
from below; 16 X. 3. Anterior part of the left valve seen from inside; 39 X. 4. A pa>’t of the selvage just inside
the lateral corner gland; 83:! X. 3. A part of the posterior margin of the shell seen from inside; 567 X. (From
speeimens from station 64 b.)
covered by the shoulder vault. The ventral margin is somewhat, though only rather slightly,
concave. The lateral corner glands have their exits on a large conical peg, which is of about
the same size and type on both valves and which extends rather considerably beyond the margin
of the shell. The processes at the postero-dorsal corner of the shell are somewhat, though only
rather slightly, shorter. Seen from below it has its greatest breadth at about the middle
and the anterior part somewhat larger than the posterior part. The side contours are rather
evenly curved except just behind the middle, where they undulate rather weakly. Both the
back and front ends are pointed; the rostra 1 process on the left valve is only slightly larger than
that on the right valve; see the appended fig. 2. The shoulder vault is well developed and is
rounded. For the sculpture see G. W. MÜLLER. The surf a c e of the shell has a very
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