MOLLUSCA; Isl 
1. Shell convoluted—The shell has an oval or linear 
mouth parallel with its length. The whorls, which are small 
segments of large circles, are wrapped round the pillar, and 
the one rising a little above the other, embrace or inclose 
the preceding ones. The four following families appear to 
belong to this division. 
Family 1. Conuside—Furnished with a long proboscis, 
and produced tentacula, with the eyes near the summit on 
the outside. The lid is placed obliquely on the foot, and 
is too small to fill the mouth of the shell. The genera Co- 
nus and Terebellum form this family. 
Family 2. Cypreade—Cloak enlarged, and capable of 
folding over the shell. There is no lid. The genus Cy- 
prea is the type. 
Family 3. Ovulade—Both extremities of the aperture 
canaliculated. The inhabitants of all the genera, Ovula, 
Calpurna, and Volva, are unknown. The last genus in- 
cludes the Bulla patula of Pennant. 
Family 4. Volutade—Canal of the aperture abbreviated. 
Pillar-lip plaited. The foot appears to be destitute of a lid. 
The genera are numerous; Voluta, Oliva, Cymbium, Mar- 
ginella, Cancellaria, Mitra, Ancilla, Volvaria, and Torna- 
tella. The last genus contains the Voluta tornatilis of Bri- 
tish writers. 
2. Shell turreted—The whorls of the shell, the revolving 
spire of which is subconical, scarcely embrace one another, 
but are merely united at the margins. Three families may 
here be established. 
Family 1. Buecinide—Canal short, scarcely produced 
beyond the anterior margin of the lip, and bent towards the 
right. The tentacula are remote, and the head is destitute 
of a hood. The mouth hasaretractile proboscis. The fol- 
