Pvn H,i I'UitlS

202 KELLIID.E.
Mr. M 'Andrew's collection, dredged by
and Lancerote in the Canary Isles.
him off Orotava
This is certainly not the young of any other shell, as
might be hastily imagined
on account of its minute size.
I have a series of all ages from the fry to the adult.
Nor does it resemble any other British shell. In some
respects it is even abnormal as a Lepton. The regular
concentric ribs and the inclination of the beaks to one
side do not occur in any of the above-described species.
The dentition, too, is peculiar. The cardinal tooth in
the left valve is united by a ledge with the lateral tooth
on the longer and broader side of the shell, so as to make
1)oth appear in, one point of view like the same tooth.
The cardinal tooth in the other valve is not discernible
unless in fresh specimens, and by means of a Coddington
lens or an equally strong microscopical power. Even
this pigmy shell, barely exceeding half a line in length,
is sometimes found to have been drilled by one of the
smaller Muricida.
4. L. Clar'kijs *, Clark.
L. Clarkia, Clark, in Ann. Nat. Hist. 2nd ser. March 1852 ;
p. 255, pi.
cxxxii. f. 7.
F. & H. iv.
Shell triangularly oval, with an oblique outline, much com-
pressed, not very thin, semitransparent and rather glossy:
sculpture, slight and numerous but irregular concentric stria?,
which are stronger and more crowded in front and at the sides,
and usually a few snow-white lines or streaks, radiating from
the beak towards the margins and more or less interrupted ;
the surface is also slightly scabrous or rough in fresh speci-
mens :
colour yellowish-white : epidermis extremely
margins abruptly
with an oblique slope to the ventral margin,
thin :
truncate but rounded at the smaller end,
which is likewise
rounded, very broad, and wedge-like at the larger end, and
forms a blunt angle behind : beaks small, projecting beyond
* Named out of compliment to Mrs. Clark, the wife of the distin-
guished British conchologist.