H. imperialis. The imperial Harp.
Species in which the number of ribs far exceeds that of any other, and occasions it often to be called the many-ridged harp; a small spiral keel round the summit. A rare and valuable species.
H. nobilis. The noble Harp. Pl. [29], fig. 2.
A regular species.
H. rosea. The roseate Harp.
Oblong-ovate; flesh coloured, with roseate interrupted bands; ribs remote; columella of a fine rosy hue.
8. Dolium. The Tun Shell. Seven species.
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.