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.Xumher af species.
Funclion of the
maxilla.
Distribution.
Type species.
I have obtained confirmation of this identification by a re-examination of the type specimen
of this species of BRADY’s (it is kept in the Zoological Museum at C o p e n h a g e n).
Unfortunatelv only the sliell is left of this important specimen; all the other organs are missing.
As is shown by the description of the sub-genus given by me above, several mistakes were found
in Brady’s description and figures. Contrary to what one would be inelined to expect from
Brady’s statements, the type specimen exhibits a marked relationship to the species described
by me below.
In addition to M. (C.) favus there are certainly two other species belonging to this
subgenus, namely Cypridina Bairdi G. S. Brady (1865, p. 387; pi. 62, fig. 7 and 1897, p. 88; pi. 16,
figs. 22 and 23) and Cypridina asymmetrica G. \V. Mëeler (1906 b, p. 14; pi. 6, figs. 1—12).
Of these two species, which are certainly very closely related to each other, the former is verv
little known; the latter, on the other hand, is one of the better known representatives of this
sub-family. Both of them confirm the correctness of the new description of the sub-genus
I have given above.
On account of the incompleteness of the descriptions it is impossible to decide whether
any more of the species hitherto described are to be included in this group.
With regard to the funetion of the maxilla in this sub-genus it may be pointed out liere
that the palp of this limb is certainly to be considered as an important organ of locomotion, while
the endites — as is usual in this sub-family — are masticatory organs. This double funetion
is rendered possible by the faet that the palp and the part from which the endites issue are
capable of free motion independently of each other.
All the forms of this sub-genus so far known come from the western part of the Pacific.
(The locality of the type specimen is, however, unknown.)
Type species: M. (C.) favus, G. S. Brady, 1902a.
M. (Cypridinodes) acuminata n. sp.
Description: — Male: —
Shell: — Length, 5,5 mm. Length : height, about 1,5 : 1; this applies to the left
valve, the right one is somewhat lower. Length : breadth, about 2:1. Seen from the
side (fig. 1), it has its greatest height at about the middle and the posterior part of the shell
is not, at least not perceptibly, larger than the anterior part. The dorsal and the ventral margins
are arched rather boldly and almost uniformly and evenly, the ventral margin is, however,
somewhat irregulär, as it is somewhat pouting anteriorly; both join the anterior and the posterior
margins without corners. The posterior part of the shell forms, at about half the height of the
shell, a rectangular, pointed corner. The rostrum has anteriorly a strongly projeeting but
broadly rounded corner; its ventral corner is narrowly rounded and strongly marked because
the ventral part of the anterior margin of the rostrum curves inwards rather decidedly. The
narrow and rather deep rostral incisur is characterized by having its posterior margin defined
from the ventral margin of the shell by a rather strongly marked corner. Seen fr o ni a b o v e
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