Pvn H,i I'UitlS

TELLINA. 387
rating the valves by a lanceolate gap or depression, which
would be a lunule if the ligament were not interposed and
were seated (as in the Veneridce) on the other side of the beak :
corselet long and rather deeply excavated ; its colour,
as well
as that of the ligamental depression, is carnation : Junge-lirw
obtusely angular: hinge-plate thick, twice as broad on the
valve two
posterior as on the anterior side : teeth, in the right
small cardinals, that under the beak on the posterior side being
the larger, triangular, and slightly cloven, besides a short but
strong anterior lateral near the cardinal tooth on that side, and
a remote and smaller lateral on the other side ; the left valve
has similar cardinals, reversed in position, but no lateral tooth:
inside highly polished and glossy, longitudinally striated towards
the front margins, which are thickened, of an orange
tint, usually marked with the posterior ray, and sometimes
with another ray or streak of the same colour on the anterior
side : pallial scar having a triangular sinus, which is shaped
like a foot and ankle (as it is also in all the species of the pre-
ceding section), very large, extending at the upper end for
three-fourths of the distance from the front margins to the
beaks, and at the sides to the edges of the muscular scars : these
last are large and irregularly oval. L. 0-8. B. 1.
Var. 1. Lantivyi. Shell of a thinner texture, whitish or
faintly tinged with yellowish-pink, not rayed. T. Lantivyi,
Payraudeau, Moll. Cors. p. 40, i.
pi.
f. 13-15.
Var. 2. distorta. Shell rather more compressed, and less
inequilateral in consequence of the posterior side being more
produced and not so truncate as in the typical form, with a
sharper point at that end. T. distorta, Poli,
f. 11.
Test. Sic. 1. 15.
Habitat : Southern, western, and eastern coasts of
England, North and South Wales, all Ireland, and west
of Scotland, in shell-sand and among nullipores, in 4-25
fathoms. Scarborough (Bean); Northumberland and
Durham, rare (Alder) j Holy Island (Eyton). I am
not certain of any more northern locality, at home or
abroad. Var. 1. Ullapool (J. G. J.). Var. 2. Exmouth
(Clark); Loch Carron (J. G. J.); Hebrides (Barlee).
This species occurs in a fossil state at Banff (J. Smith) ;
Coralline Crag (S.Wood); Subapenninetertiaries (Brocs2