RANELLA. TRACHELIPODA. 39 
with a lengthened canal, sometimes very long, frequently 
recurved ; outer surface protected by a thick horny epider- 
mis ; aperture provided with a horny operculum, 
Murex Cristatus. Plate VI. fig. 10. Found in the Lon- 
don Clay at Highgate Hill. 
There is some difficulty in discriminating the Murices; they are distin- 
guished from the Tritoni@ by the smooth columella, instead of being rugose, 
and in always having three varices at least; they differ from Fusus and 
Fasciolaria in their general shape, and again in the varices, of which those 
genera are always destitute; and Ranella has but two rows of varices; the 
general shape, and elongated canal, remove them from Recinula; and the 
shorter proportion of the spire, separates them from Cerithium, in which it 
is invariably longer than the aperture. 
The species of this genus are very numerous, and inhabit the seas of almost 
all countries. 
Fossil Murices are tolerably abundant, and occur in the London Clay, 
Blue Chalk Marle, Scuth of France; the Super Cretaceous Rocks of Bor- 
deaux and Dax, also in the Cretaceous and Oolitic groups of rocks. 
Genus XXX.— TYPHIS. — Montfort. 
Generic Character. — Shell subcylindrical, subturreted ; 
volutions provided with numerous cylindrical, pervious pro- 
cesses ; aperture suborbicular; beak short, with a closed 
tubular canal. 
Typhis fistulosus. Plate ILI. fig. 35. Found in the 
London Clay at Barton Cliff. 
The shells of this genus seem only to be found in a fossil state, and in the 
newer formations; namely, the Super Cretaceous rocks of Bordeaux and 
Dax, &e. 
Genus XXXI.— RANELLA. — Lamarck. 
Generic Character. — Shell oval, or oblong ; subcom- 
pressed ; with depressed straight or slightly oblique distich- 
ous, and frequently spinous varices, situated at intervals of 
half a volution, forming a continuous longitudinal row on 
each side; aperture subovate; base canaliculated; and 
frequently with a small canal above, at the junction of the 
outer and inner lips; outer lip grooved, with its edge cre- 
nated, or dentated; inner lip usually rugose, the outside 
more or less tuberculate, frequently set in small bead-like 
rows, and generally covered with a thickish olivaceous 
epidermis, 
Ranella Bartonensis. Plate III. fig. 41, Found in the 
London Clay at Barton Cliff. 
The two lateral rows of varices at once distinguish this genus, as well as their 
general construction. The only genus with which they may be confounded is 
