Pvn H,i I'UitlS

414 MACTRIDvE.
fathoms (Barlee) . In the latter case only were the specimens
perfect, although young, and without the animal.
Laskey gives " Dunbar/'' which (to say the least) is a
questionable locality. The notices of its extra-British
occurrence are as follows : Cherbourg (Recluz) ; coasts
of Spain and Portugal, Madeira and the Canaries, at
depths varying from 12 to 30 fathoms (M f
Andrew) ;
St. Michael, Azores (H.Drouet); Red Sea (Forbes and
Hanley) .
The animal is unknown. M fAndrew seems to be the
only one who has taken this curious species in a living
state, and he probably had no opportunity of examin-
ing it.
The A. nitens of Montagu is West Indian and not
British.
A. corneum (Mactra cornea, Poli, but not A. cornea
of Lamarck), being the Donaoc plebeia of Pulteney, A.
donacilla of Lamarck, and Donacilla Lamarckii of Phi-
lippi, is a common Mediterranean shell, but has never
been dredged or taken on our coasts under circumstances
that would preclude its being considered exotic.
A. deauratum (Turton), or Mesodesma Jauresii of De
Joannis, which according to Turton was dredged off
Exmouth, is a Newfoundland species. I was informed
that the original specimen came from Lieutenant Grif-
fiths, who had made more than one voyage to North
America, and whose mother's collection of shells was
much enriched by his endeavours to please her. Mrs.
Griffiths was an old correspondent of Dr. Turton, as is
evident from the frequent mention of her name in his
1
Dithyra.'