32
ANATINIDiE,
Tellina coruscans of Scacclii, and Pandora ? (squivalvis
of Philippi. It likewise appears to be the Mya membranaceaoi Gmelin, from Miiller's 'Prodromus/ judging
from the description ; although Dr. Morch informs me
that the shell figured in Olafsen and Povelsen's Voyage
to Iceland, and referred to by Miiller for this species,
represents Astarte sulcata, var. elliptica.
Family XVIII. ANATI^IDiE, D'Orbigny.
Body oval or oblong : mantleYevj i\mi.: tubes lon^ ; orifices
fringed : gills one on each side : palps two on each side : foot
lanceolate or tongue-shaped, small, and compressed.
Shell oval or oblong, sHghtly inequivalve, gaping more or
less on each side, and truncated at the posterior end : healcs
small, inclining to the posterior side, mostly fissured : epidermis
slight : ligament sometimes external and situate at the posterior
side, besides invariably an internal cartilage, which is contained
in a pit or receptacle imder the beak in each valve : hinge furnished with a free crescentic ossicle, placed across the hingeline at the anterior side of the beaks ; otherwise toothless :
pallial scar narrowly but deeply sinuated : muscular scars
small and irregular.
The typical genus, Anatina, is a native of tropical seas.
It may be distinguished from Thracia in the tubes being
united, the pearly nature of the shell, and in having
inside an oblique falciform rib, proceeding from the cartilage-pit towards the posterior side in each valve. This
process is formed apparently in consequence of the
beaks being fissured in that direction, and it serves as
an upright girder to strengthen the sliell. Something
of the same kind, however, may be observed in most
species of Thracia.
The genus Anatina of Schumacher
is different from that of Lamarck, and belongs to the
Mactridce.
The Anatinidce usually frequent a sandy or
ANATINIDiE,
Tellina coruscans of Scacclii, and Pandora ? (squivalvis
of Philippi. It likewise appears to be the Mya membranaceaoi Gmelin, from Miiller's 'Prodromus/ judging
from the description ; although Dr. Morch informs me
that the shell figured in Olafsen and Povelsen's Voyage
to Iceland, and referred to by Miiller for this species,
represents Astarte sulcata, var. elliptica.
Family XVIII. ANATI^IDiE, D'Orbigny.
Body oval or oblong : mantleYevj i\mi.: tubes lon^ ; orifices
fringed : gills one on each side : palps two on each side : foot
lanceolate or tongue-shaped, small, and compressed.
Shell oval or oblong, sHghtly inequivalve, gaping more or
less on each side, and truncated at the posterior end : healcs
small, inclining to the posterior side, mostly fissured : epidermis
slight : ligament sometimes external and situate at the posterior
side, besides invariably an internal cartilage, which is contained
in a pit or receptacle imder the beak in each valve : hinge furnished with a free crescentic ossicle, placed across the hingeline at the anterior side of the beaks ; otherwise toothless :
pallial scar narrowly but deeply sinuated : muscular scars
small and irregular.
The typical genus, Anatina, is a native of tropical seas.
It may be distinguished from Thracia in the tubes being
united, the pearly nature of the shell, and in having
inside an oblique falciform rib, proceeding from the cartilage-pit towards the posterior side in each valve. This
process is formed apparently in consequence of the
beaks being fissured in that direction, and it serves as
an upright girder to strengthen the sliell. Something
of the same kind, however, may be observed in most
species of Thracia.
The genus Anatina of Schumacher
is different from that of Lamarck, and belongs to the
Mactridce.
The Anatinidce usually frequent a sandy or