Pvn H,i I'UitlS

LUTRARIA. 431
" branchial") one is much larger than the other, and its orifice
is fringed with 30-40 fine cirri, one half of which are stronger
and longer than the intermediate cirri and fimbriated on each
side ; the terminal cirri of the excretal tube are shorter and
equal ; tubular sheath covered with a brown : epidermis gills
narrow, pale drab : palps very large, triangular, pointed, of a
thin membranous texture, pale brown elegantly speckled with
minute red-brown : points foot large, fleshy, and white with a
tinge of pale brown.
Shell scimitar- shaped, smaller than that of L. elliptic^,
much broader with respect to its length, more convex, cylin-
drical, and solid, upturned at the posterior end, which is
rounded ; the anterior side is considerably shorter in propor-
tion ;
the cardinal tooth on the anterior side in the right valve
is double, and there is no posterior lateral in either Talve.
L. 2. B. 4.
Habitat : In similar situations, but not so generally
It is rather common in the
diffused as the last species.
Channel Isles, and has been taken on the coasts of
Dorset, Devon, Cornwall, and Ireland. It is said that
the late Mr. Lyons found it in Pembrokeshire ; and Mr.
Maclaurin included it in his list of shells from Cold-
ingham Bay, Berwickshire. Belfast " alluvial" deposit
(Hyndman and Grainger); Sussex tertiaries (Godwin-
Austen); Coralline Crag (coll. S. Wood in Brit. Mus.);
Subapennine strata (Brocchi) ; Monte Mario near Rome
(Lamarck) ; Sicily (Philippi). It has not been noticed
anywhere north of Great Britain ; but its distribution
southwards extends from Normandy to Lisbon, Nice,
and Algeria, its depth ranging from low-water mark to
12 fathoms.
Although this species comes very near the last, my
iconoclastic propensities are not strong enough to unite
them at present. If their form is variable, and not to
be relied upon as a mark of distinction, the dentition of
each is somewhat different. I am not aware whether