Pvn H,i I'UitlS

182 ARCID.E.
sen has dredged it on the coast of Norway in 10-20
fathoms, and Malm on the coast of Sweden in 80-100
fathoms. * M
fAndrew has taken it alive on the Spanish
shore ; and Forbes has recorded its range of depth in
the iEgean as 30-80 fathoms.
The valves of this curious shell are so deep, that
Lister mistook them for sessile Barnacles, and called
them Balanus Bellonii. The animal is very shy and
sensitive. According to Mr. Clark a glutinous fluid
appears to exude from a special gland to supply the
byssus, which is moulded by the foot. Capt. Brown
says the shell " burrows in hard clay and limestone
rocks " ; but this does not accord with my observation
of its habits.
In all probability this is the Norwegian shell men-
tioned by Linne,
in his i
Systema Naturae/
as like A.
tortuosa but of much smaller size. That species in-
habits the Indian Ocean. Miiller applied the above
name,
in his (
present species,
Prodromus/ to what appears
and Pennant did the same in his '
to be the
British
Zoology/ Lamarck called it A. cardissa. Montagu
and subsequent writers on British conchology considered
it was the A. fusca of Solander's MS., although Bru-
guiere's species of that name is different. Turton, in
his s
mistook it for A. Noce
Conchological Dictionary/
of Linne, a well-known Mediterranean shell, which has
never been authenticated as a native of the British seas.
Philippi and Loven adopted Bruguiere's name, navi-
cularis ; but that species is stated to inhabit the coast
of St. Domingo, and is very unlike our shell. Mr. Reeve
has added another name (Britannica) to this long list.
Weinkauff has, on the other hand, proposed
a reduc-
tion of the catalogue, by uniting the present species
with A. Noce. He says that he has found specimens at