33 
Planaxis. — Shell ovate-conical, solid : aperture ovate, sublongitudinal. Columella flat 
and truncated at the base, separated from the right margin by a narrow sinus 
Interior surface of the right margin furrowed or lineated, and a callosity running 
under the summit. 
Plate XVI. Fig. 18. P. sulcata. (Buccin.um sulcatum. — Bruge.) 
Pii asia nell a. — Shell ovate or conical, solid: aperture entire, oval, longitudinal ; the lips 
disunited at the upper part, the right sharp, not reflected: columella smooth, 
compressed, attenuated at the base : operculum calcareous, or horny. 
Plate XVII. Fig - . 1. P. bulimoides. (Buccinum australe. — Gmel.) 
Turritella. —Shell turreted, not pearly: aperture rounded, entire; the margins dis- 
united at the upper part: a sinus in the right lip. Operculum horny. 
Plate XVII. Fig. 2. T. bicingulata. 
SECTION II. 
TRACHELIPODA ZOOPHAGA. 
Shell spirivalve, ensheathing ; aperture either canaliculated, notched, or inclined at the base. 
There are Five Families in this Section, viz. Canalifera, Alata, Purpurifera, Columellaria, 
and Convoluta. 
CANALIFERA. — II Genera. 
Shell with a canal more or less long at the base of the aperture, the right lip of which does not 
change its form by age. 
This Family is separated into Two Divisions. 
Division 1. — No constant varix on the right lip. 
Cerithium. — Shell turreted : aperture oblong, oblique, terminated at the base by a short 
truncated or recurved canal, never notched ; a small channel at the upper extre- 
mity of the right lip. Operculum small, orbicular, and horny. 
Plate XVII. Fig. 3. C. palustre. (Stroinbus palustris. — Linn.) 
Pleurotoma. — Shell turreted or fusiform, terminated at the lower part by a straight ca- 
nal, more or less elongated. A fissure or sinus in the upper part of the right lip. 
Plate XVII. Fig. 4. P. nodifera, (Murex Javanus. — Gmel.) 
Turbinella. — Shell turbinate, or sub-fusiform ; base canaliculated, having on the colu- 
mella from three to five compressed and transverse plaits. 
Plate XVII. Fig 5. T. pyrum. (Voluta pyrum. — Linn.) 
Cancellaria. — Shell oval or turreted : base of the aperture sub-canaliculated ; little or 
no canal. Columella plaited; the plaits sometimes few, sometimes numerous, 
mostly transverse ; the right lip furrowed internally. 
Plate XVII. Fig. 6. C. reticulata. (Voluta reticulata.— Linn.) 
F 
