26 TRACHELIPODA. OLIVA. 
ORDER IV.—TRACHELIPODA. 
Posterior portion of the body spirally convolute, and 
separated from the foot, and always enveloped in a shell ; 
foot free, flattened,:and attached to the inferior base of the 
neck, or the anterior portion of the body, and forming a 
member of locomotion ; shell spiral and enveloping, with a 
canaliculate aperture, notched or effuse at the base. 
GRAND-DIVISION I.—ZOOPHAGOUS TRACHELIPODA. 
Animals always inhabiting the ocean, and feed upon other animals; pro- 
vided with a protruding syphon, and respiring water only, which is conducted 
to the branchiez by this syphon: they are destitute of maxilla, and have a 
retractile proboscis. 
TRIBE I.—INVOLUTE. 
Shell without a canal, but having the base of the aperture 
notched or effuse ; the spiral convolutions broad, compressed, 
and rolled up in such a manner that the external one almost 
entirely envelopes the others. 
Genus I1.— CONUS. — Linneus. 
Generic Character. — Shell inversely turbinate, conical ; 
spire generally short ; aperture longitudinal, linear, entire, 
narrow, and sub-effuse at the base; columella smooth, and 
destitute of teeth ; outer lip sometimes emarginate above. 
Section 1.— Spire short. 
Section 2. — Spire elongated. 
Section 8.— Shell ventricose. 
Conus scabriusculus. Plate III, fig. 18. Found in the 
London Clay at Barton. 
Conus antediluvianus. Plate III. fig. 19. Found in the 
London Clay. 
The shells of this genus are marine, and are by no means numerous in a 
fossil state; they are, however, found sparingly in England, in the Crag and 
London Clay; the Calcaire-grossier of France, the Terrains Cacareo- 
trapeeus of Brongniart, and contemporaneous strata of other countries. Mr 
Phillips and Mr Conybeare mention some imperfect casts, which they have 
noticed in the Inferior Oolite ; but these are not positively ascertained to belong 
to this genus. 
Genus I1.— OLIVA. — Bruguiere. 
Generic Character.—Shell oblong, subcylindrical, convo- 
lute, smooth, and glabrous ; spire short, the volutions sepa- 
