The shells of this genus are generally large, thin, and globose, with a
wide aperture, and toothed or crenated outer lip; they have a brittle
and light structure, and although some of them grow to a very large
size, they retain their characteristic fragility and thinness.
Shell sub-globular, very ventricose, thin, encircled by decurrent
flutings; the spire very short; the last turn much larger than all the
others together; aperture oblong, very large, by the great excavation of
the right edge, which is crenated through all its length; columella
twisted; operculum unknown.
Dolium galea.
D. olearium.
D. maculatum.
D. fasciatum.
D. pomum.
D. variegatum.
D. perdix.
_D. perdix._ The Partridge Dolium. Pl. 29, fig. 4.
Species sub-umbilicated, ovate-oblong, thin, thickly ribbed, and convex;
colour reddish brown, clouded and spotted with white.
_D. galea._ The brown Tun.
Species not umbilicated; sometimes exceeds ten inches in diameter.