Pvn H,i I'UitlS

jcardium. '275
nately and without regard to their natural connexion.
The characters assigned by Linne to C. tuberculatum
(" sulcis obtusis nodosis transversim striatis ") are more
applicable to our shell than those by which C. rusticum
is described, viz. " sulcis xx remotis interstitiis rugosis."
For the above reasons, and because every writer on
European or British conchology, except
Poli in the last
century and Forbes and Hanley of late years, has applied
the name of rusticum to a varietv of C. edule. it would
seem undesirable to reject the well-known and appropriate
name of tuberculatum. I may also observe that
Mr. Hanley, in his Supplement to Wood's (
Index Tes-
taceologicus '
(the publication of which was completed
in 1856), regarded the C. rusticum of Linne as "probably
a "
variety of edule The C. ciliare of Donovan
(but not of Linne) and C. nodosum of Montagu (but not
of Turton) are the young of the present species.
4. C. papillo'sum*, Poli.
C. papillosum, Poli, Test. utr. Sicil. ii. p. 56, t. xvi. f. 2-4.
Shell very gibbous and nearly globular, with a somewhat
25 or 2(5
oblique outline, solid and :
opaque, glossy sculpture,
flattened ribs, with very narrow furrows or interstices between
them ; each rib is furnished with a series of white tubercles,
which are conical and more or less incurved on the posterior
side, smaller in the middle, and bluntly triangular or calyciform
on the anterior side the furrows are crossed and in-
;
dented by numerous regular, narrow slits or : punctures colour
yellowish, sometimes variegated by
reddish-brown streaks or
fibrous and
bands, especially on the posterior side : epidermis
rather coarse, light yellowish-brown, only observable in the
rounded on the anterior side, with an ob-
furrows : margins
lique slope to the front, which is also curved, and obtusely
truncate on the posterior side, which is expanded and twice
the breadth of the other side ; a blunt and indistinct angle
* Covered with papilla 1 .