104 
PLEUROTOMA exorta. 
TAB. CXLVI.—Fig. 2. 
Spec. Cuar. 'Turreted, base conical, elongated ; 
whorls concave and smooth above, below longi- 
tudinally undulated and convex ; with many 
elevated subtuberculated lines ; aperture ovate, 
elongated, canaliculated. . 
Syn. Murex exortus. Brand. f. 32. 
onerruprar undulations or coste 12 or 14, rounded 
and strongest on the spire ; the smooth concave part of 
the whorl is bounded by the commencement of the costa 
which is rather sudden; length of the aperture, including 
the beaks, equal to two-fifths of the whole shell; the 
lines of growth are indistinct, but form small tubercles 
upon the transverse lines. 
From Barton. It appears to be Murex exortus of 
Brander, or at any rate a variety approaching his M. 
macilentus. The Pleurotoma dentata of Lamarck, 
under which M. exortus is quoted, with a mark of doubt, 
is certainly distinct from any Hampshire shell I am ac- 
quainted with, as I learn from a French specimen sent 
me by Monsieur De France. 
PLEUROTOMA rostrata. 
TAB. CXLVI.—Fig. 3. 
Spec. Cuar. Fusiform, with many transverse 
ridges aud short costee, volutions obscurely de- 
cussated, expanded and slightly concave above, 
rather ventricose and roughish below: aper- 
ture elongated, canaliculated. 
Syn. Murexrostratus. Brand. f. 34. 
Coste numerous, obscure on the latter whorls; the de- 
cussations on the upper part of the whorls are very 
slight, but most distinct near the edge; the transverse 
ridges are quite free from tubercles, but are roughened 
by the lines of growth; the aperture and beak occupy 
half the length of the shell. 
