10 # 
PLEUROTOMA exorta. 
TAB. CXLYL —Fig. 2 . 
Spec. Char. Turreted, base conical, elongated ; 
whorls concave and smooth above, below longi- 
tudinally undulated and convex ; with many 
elevated subtuberculated lines ; aperture ovate, 
elongated, canaliculated, 
f Syn. Murex exortus. Brand . f. 32. 
liONGiTUDiNAL undulations or costae 12 or 14, rounded 
and strongest on the spire ; the smooth concave part of 
the whorl is bounded by the commencement of the costai 
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. 
maeilentus. The Pieurotoma 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. CXLYI. — Fig. 3. 
Spec. Char. Fusiform, with many transverse 
ridges aud short costag, volutions obscurely de- 
cussated, expanded and slightly concave above, 
rather ventricose and roughish below : aper- 
ture elongated, canaliculated. 
Syn. Murex rostratus. Brand . f. 34 . 
Costae numerous, obscure on the latter whorls; the de- 
cussations oh 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 sheik 
