Pvn H,i I'UitlS

to be a West-Indian shell ;
MACTRID^. 411
and there is no satisfactory
evidence that it has ever been found in the British seas,
much less in the Firth of Forth.
D. clenticidatus (Linne) is West Indian, and likewise
Chemnitz called it D, punctata, Da Costa
f spurious."
Cuneus truncatus, and Donovan D. crenulata, the last
common on the western coasts
alleging that it was " very
of England and also on those of Ireland and Scotland."
Linne assigned to this species the Mediterranean as a
habitat, on the authority of F. Logie, one of his pupils ;
Payraudeau
same locality ;
and others afterwards recorded it from the
and the Rev. R. T. Lowe lately observed
specimens at ' '
Mogador. It is the Nusar v of Adanson.
Family XV. MAC'TRID^E, (Mactrache) Fleming.
Body oval or : oblong mantle closed to some extent, fringed
at its : edges tubes more or less elongated, in some genera
united and in others :
separate gills consisting of an unequal
on each side :
pair foot tongue-shaped and flexible.
Shell equivalve, triangularly oval or oblong, sometimes
gaping at the posterior end or at both ends, usually sculptured
by fine concentric striae : epidermis fibrous : ligament double,
the external one slight and placed on the larger side of the
shell, and the internal one (or cartilage) solid, placed
on the
same side, and occupying a large pit or cavity in the hinge :
teeth, two cardinals in each valve (except in tScrohicularia,
which has only one in the left valve), besides more or less dis-
tinct laterals :
distinct.
pallial scar sinuated : muscular scars deep or
The present volume will conclude with this family,
being the last of those which have the mantle open.
is remarkable for possessing a double ligament, one ex-
ternal and the other internal ;
It
but otherwise it is not of
much repute, whether we look to the shape
colour of the shell. Usually
or to the
the former is short or
stumpy, and the latter pale and unattractive. It is,
t 2