Pvn H,i I'UitlS

372 tellinim:.
but not extend-
gitudinally lineated : pallial scar slight, large,
far ii into the interior : muscular scars well defined. L. 0*75.
ing
B. 0-85.
Habitat :
Rare (in the sense of local), in fine sand,
at the undermentioned places and depths : Falmouth,
among trawl refuse from about 20 fathoms (Miss Vigors,
Mrs. Gulson, and Mr. Cocks) ; Birterbuy Bay, co. Gal-
way, 18-20 fathoms (Barlee and J. G. J.) ; Stornoway
and Skye, 40-50 fathoms (Barlee) ; Moray Firth, in deep
water (Macdonald) ; Shetland, 18-78 fathoms (J. G. J.).
Fossil in the Coralline Crag (S. Wood). It inhabits
every part of the Mediterranean, Adriatic, and ^Egean,
at from 6 to 50 fathoms, and M'Andrew has dredged
it off Madeira and the Canary Isles in 20-25 fathoms.
Philippi enumerated it as a Sicilian tertiary r shell.
This is one of the much sought-for treasures of the
British conchologist, apparently scarce,
many parts of the North Atlantic,
" All scatter'd in the bosom of the sea."
but found in
The market-price of perfect specimens may be said,
in mercantile phrase, to " rule " from £2 to .£5. Separate
valves and fragments have not unfrequently been
brought up in the dredge
on the eastern coasts of Shet-
land, at a considerable distance from land, and far be-
the course or influence of the Gulf-stream. The
yond
fry are triangular, and in shape not unlike those of
Lucina borealis. My largest specimen (a single valve)
is about an inch in breadth. The dimensions of British
examples greatly exceed those of any from the Mediter-
ranean; and they can always be thus distinguished.
Although the present species may be considered a
southern form, it is a striking illustration of the fact
that the development of size in individuals of the same
species in the Mollusca increases northward. Lilljeborg