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Penis: — This is constructed according to tke type that is charaeteristic for this
sub-family. For details see the accompanying figures 23 and 24.
Furca (fig. 25) : — This has six claws, the five posterior ones decreasing fairly uniformly
and strongly in length and strength the more proximally they are situated. All the claws are
well defined from the lamella except no. 2, which is entirely united to this. Proximally of the
claws the furca is smooth.
U p p e r lip (fig. 26) : — The unpaired upper glandular field is rather large and has
numerous pegs of about equal size (— the mouths of the glands). The two paired ventral ones
are moderately large. The fang-like processes on which the latter are situated issue dorsally
from two rather large, wing-like processes, which are cut transversally off distally and there
(ventrally of the fang-like processes) coarsely serrated, having about twelve or thirteen teeth.
(It is to be observed that no glands have their mouths on these teeth.) The outside of the fang-like
processes has a dense longitudinal row of bristles at about the middle. These bristles hang
down like drapery; the proximal ones of them are about as long as the height of the processes
proximally, rather broad proximally, narro wing distally and most frequently split at this part;
the others decrease in length and breadth the more distally they are situated on the processes.
Ventrally the fang-like processes are furnished thickly with fine more or less short hairs and
dorsally they have groups of short, stiff hairs as well. The upper lip lias groups of short,
stiff hairs proximo-ventrally as well. The protubérance dorsally of the upper lip is small.
The rod-s haped organ (fig. 11) is very short and thick, somewhat drawn in
distally, so as to seem sharply truncated with a small projecting distal knob, the point of the organ.
The lateral eyes are very large.
The back of the body has strong transverse folds.
No f e m a 1 e is known.
Remarks: — Even with regard to the shell this species is distinguished so markedly from
the other species of this sub-genus that there is no danger of any confusion. In the case of
none of the species M. (C.) favus, M. (C.) Bairdi and M. (C.) asymmetrica is there information
of any shell longer than 3 mm., while the species described above is no less than 5,5 mm. long.
The shape and sculpture of the shells are also very different.
The relationship between these species is impossible to decide because of the incompleteness
of preceding descriptions.
Habitat: — Australia:
Cape Jaubert (type local i ty); depth: 25 m.; 13. VII. 1911: one mature male
(coll. E. Mjöberg).
Differences from
other species.
Relationship of the
species.
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