DESCRIPTION OF SHELLS. 183 
Pleurotoma amphiconus. (Tab. VIII. figs. 7 & 8.) 
Spec. Cuar.—Doubly conical, smooth, with a few striz round the base, and 
about three striz near the upper part of each whorl ; spire and aperture of equal 
length. 
Width 2, length 5. 
More common than P. prisca, from which it differs in the equality of the two 
cones of which it is formed. 
Pleurotoma curvicosta. (Tab. VII. fig. 17.) 
Spec. Cuar.—Fusiform, rather short, transversely striated, longitudinally 
ribbed or waved ; ribs few, curved, thickened upwards ; aperture elongated ; 
beak short, straight. 
Twice as long as wide. 
A species of Pleurotoma which connects that genus with Fusus, with which 
indeed I have sometimes placed it. 
Pleurotoma inarata. (Tab. VI. fig. 21.) 
Spec. Cuar.—Fusiform, elongated, transversely striated ; whorls convex with 
the upper edge extended and crenulated; striz numerous, the spaces between 
them nearly smooth ; aperture short-oval, with an elongated, very slightly curved 
canal. 
Three times as long as wide: the canal equal to the spire. 
This differs from Plewrotoma rostrata, which is not found at Bracklesham, 
chiefly in the absence of ribs or undulations. 
Pleurotoma gentilis. (Tab. VI. fig. 25.) 
Spec. Cuar.—Fusiform, elongated, acute, longitudinally ribbed and trans- 
versely striated; whorls convex in their lower parts, concave above ; ribs 
numerous, thin, obscure in the hollow part of the whorls ; aperture nearly round, 
with a short canal above and a long canal below; beak narrow, straight, longer 
than the round part of the aperture. 
Above three times as long as wide ; aperture, including the canal, nearly as 
long as the spire. 
An elegant strongly marked shell; in Mr. Edwards’s Cabinet. 
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