Original Combination:

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Original Description:

Shell very globose, transparent, brittle, thin, shining, reddish; spire very short, conic ; whorls four, convex, lightly wrinkled, rapidly increasing, the last very large and ventricose; suture moderate; aperture circular, equally high and broad, within bluish and slightly thickened by a very thin white callus; perist. simple, sharp, thin, at its junction with the body whorl, violet colored and reflected, so as to cover a portion of the small and deep umbilicus; the parietal wall of the aperture is covered with a light violet colored callus.
Diam. maj. 2G; min. 20; alt. 13 mill.
Habitat on the banks of the Wabash River, (Mrs. Say!) In Illinois (R. Kennicott!)
Belongs to the same group as H. fuliginosa, Binney—but readily distinguished from that and all described species by its transparent, globular shell, ventricose body-whorl, and circular aperture. At the localities where it was found by Mr. Kennicott, H. fuliginosa was not noticed.
There is a shell received from Texas, by Dr. Newcomb, which may prove to be identical with this.
In the collection of the Academy.