Pvn H,i I'UitlS

LUTRARIA. 427
other mollusks, and reveals its hiding-place." Mr. G. H.
King, of No. 190 Portland Road, lately kept a living
specimen in one of his tanks, among other interesting
things which this experienced naturalist dealer has exhibited
to the public. Polios description of the animal
is very short:— margin of the mantle flattened and
tubes rather long, united throughout,
and cir-
fringed \
rous foot lanceolate. It ; goes by the name of " Schias"
at Granville, and is sold in the fish-market at Brest.
Born described this species from a single valve, but
accurately and unmistakeably. It was named by Chem-
nitz " Mactrahelva seuhelvacea"—
scarcely a binominal
appellation. He seems to have occasionally exercised a
good deal of useless ingenuity in inventing new names,
even when he was aware of those given by the disco-
verers. Thus we have seen that the M. solida of Linne
became his M. vulgaris. The present species is the
M. Neapolitana of Poli.
The M. fragilis of Chemnitz (M. dealbata, Pulteney,
and M. Braziliana, Lamarck) is South American, and
not British. Turton's specimen (a single valve) is so
battered and antiquated that its exotic source may be
safely taken for granted, with a mental reservation or
doubt as to the correctness of his statement that it was
"
dredged in the Channel, near Guernsea."
Genus III. LUTRA'RIA % Lamarck. PL VIII. f.3.
Body elongated and somewhat cylindrical, compressed :
mantle thick : tubes very long, united almost to their extre-
mities and enclosed in one sheath ;
orifices fimbriated.
Shell oblong, very inequilateral, widely gaping at both
ends, especially on the posterior side, slightly and concentrically
striated: heals turned towards the anterior side and
* Associated with the otter.