FAMILY XIV.
Plicacea. Two genera.

1. Genus Tornatella. Pl. [XI].

Animal. Body oval, subspiral; foot divided into two heels by a wide transverse furrow; head provided with two vertical cylindrical tentacula, having the eyes placed sessilely upon their interior side.

Shell. Convolute, oval, cylindrical, mostly striated transversely; no epidermis; spire very short, last whorl much larger than all the others together; one or two large plaits on the columella. Inhabits the coast of Britain. Six species.

2. Genus Pyramidella. Pl. [XI].

Animal. As preceding genus.

Shell. Smooth and turreted, without epidermis; elongated, conical, or subturriculated; aperture entire, demioval; the outer lip sharp and dentated within, columella produced, subperforate at the base, furnished with transverse plaits. Inhabits the American and W. Indian seas. Six species.