FAMILY XX.
Convoluta. Six genera.
1. Ovula. The Egg. 12 species.
This is the first genus of Lamarck’s arrangement of convoluted shells; it is nearly allied to the Cypræa, but easily distinguished from it by the want of spire, and by not having teeth on the columellar lip; the right lip is reflected inwardly, sometimes wrinkled and sometimes smooth.
Shell oblong, convex, resembling the Cypræa in form, with the two extremities of the aperture notched, and more or less prolonged like a tube; the left margin dentated.
Ovula oviformis.
O. angulosa.
O. verrucosa.
O. hordacea.
O. spelta.
O. birostris.