I was at that time also aware of the existence, in several plants, of a foramen in the coats of the Ovulum, always distinct from, and in some cases diametrically opposite to the external umbilicus, and which I had in no instance found cohering either directly with the parietes of the Ovarium, or with any process derived from them.

Shell conical, thin, pellucid, whitish-brown, with a narrow central spiral brown band; whorls contiguous, convex, smooth, with numerous close oblique slightly raised, thin, simple-edged cross ribs; axis umbilicated; umbilicus narrow; mouth small, ovate, orbicular; axis three-eighths, diameter one-fourth of an inch.