120 
MOLLUSCOUS ANIMALS. 
Pleurotoma cryptorrapiie, t. 34. /. 8. Sow. Tank. Cat.App.xiv. 
Murex and Pleurotoma bicarinata. Wood, Cat. Suppl. t. 5,/. 7. 
Shell turreted, brown ; spire subulate, nearly twice as long as the mouth ; whorls convex, acutely 
keeled, with an impression close to the suture, and the last whorls with several keeled ridges in front. 
Mouth ovate ; canal not so long as the mouth, tortuous, and slightly umbilicated. Axis 2 inches, 9 lines ; 
diam. 9 lines. 
Pleurotoma cingulifera, t. 34. /. 1. Lam. Hist. vii. 94. 
Shell subulate, turreted, white, minutely brown dotted, the dots sometimes forming cross waves ; the 
whorls rounded, convex, finely spirally striated, front of the upper with two, and of the last with four or five 
angular ridges, the hinder part with a convex rounded ridge marked with square reddish spots, formed of three 
raised ridges ; the suture deeply impressed. The mouth ovate, oblong ; the canal short, rather wide, recurved, 
the slit rather wide, placed on the angular ridge. Axis 2% inches; diam. } inch. 
It is much to be regretted that Mr. Wood should have altered in his Supplement the names given to this 
and other species, especially where the figures were taken from the specimens in the Museum, which were 
named as far as possible after their original describer. 
Pleurotoma albina, t. 34./. 4. Lam. Hist. vii. 96. 
Shell fusiform, turreted, white ; whorls with rather unequal slightly raised spiral ridges, with fine spiral 
lines between them, and angularly keeled behind, the angular ridge with quadrate brown spots, each formed 
of three brown raised lines. The mouth ovate, lanceolate ; the canal slender, cylindrical, rather shorter than 
the spire, the slit deep, placed on the angular ridge. Axis 2 inches; diam. \ inch. 
This shell agrees with P. cingulifera in the square spots on the keel, but differs in the canal being 
elongated. 
Pleurotoma tuberculata. 
Shell fusiform, turreted, white, brown spotted, tubercular; spire elongated, slender; whorls with a 
posterior groove, and spiral series of rounded tubercles, the last with from eight to ten distant beaded spiral 
ridges, those of the canal least beaded. Mouth ovate, with a deep wide sub-posterior notch; canal elongated, 
straight. Axis 16 lines. 
Inhab. 
BUCCINIDiE. 
CASSIS. 
The foot oblong, moderate sized. Trunk rather short, cylindrical, ringed. The tentacles short, conical, 
on the sides of the base of the trunk, with the eyes placed near the outer side of their base. 
The operculum varies with the species which I have examined. In Cassis Bezoar it is half ovate, thin 
horny, smooth, red; crown concentrically ringed, with the nucleus placed in the centre near the margin 
of the straight side, which is bent up and slightly thickened. In Cassis achatina the operculum is oblong, 
with the inner side rather convex, the outer surface deeply radiately grooved, and the outer rounded edge 
deeply crenated, rounder behind, and rather acute in front. 
The Queen Conch, and probably all the species which have narrow mouths, has a narrow oblong 
operculum, not more than one-third the length of the mouth. 
