Pvn H,i I'UitlS

LEPTON. 201
hairs, which are so delicate as to be almost invisible, is
not less worthy of admiration than its larger and more
showy congener.
B. Shell concentrically grooved, or marked with fine longitudinal
lines.
3. L. sulca'tulum *, Jeffreys.
L. suleatulum, Jeffr. in Ann. Nat. Hist. 3rd ser. Jan. 1859, p. 34, pi. '1.
f. 2 a-g.
Body of a light yellowish -brown colour.
Shell nearly circular, the contour being interrupted only
by the prominence of the beaks, somewhat compressed, thin,
semitransparent and glossy: sculpture, broad, numerous and
regular concentric ribs, which are equally strong and distinct
throughout the surface, and still more numerous and line lon-
gitudinal lines, which are not perceptible by the naked : eye
colour clear white : epidermis filmy : margins rounded at the
sides and in front, with a gentle fall from the beak to each
end : beaks projecting a little beyond the dorsal margin, slightly
inclined towards the narrower and shorter side : hinge-liae
obtusely triangular, occupying scarcely one-fourth of the cir-
close to the beak on the
cumference : cartilage small, placed
shorter side : hinge-plate broad and thick, not much excavated
for the reception of the cartilage : teeth, one strong and erect
cardinal in the left valve, and a much smaller one in the right
valve, besides a remarkably strong and triangular lateral on
that on the broader side
each side of the beak in both valves ;
the grooves into which these lateral
is longer than the other ;
teeth lock are : correspondingly deep inside nacreous and
glossy, with a plain margin
B. 0-06.
: sears rather distinct. L. 0-055.
Habitat : Rather plentiful among corallines in the
laminarian zone at Guernsey. I also found it at
Etretat on the coast of Normandy, as well as among
some small shells from Sardinia which I received from
M. Hupe for examination j and I noticed specimens in
* Slightly furrowed.
K 5