Gualtieri's figure at _tab._ 6. _fig._ D, is an admirable representation of _A. pallida_, which, not having his work before me at the time, I could not quote; the other at C is a very good one of the present shell. The upper drawing is from one in my own cabinet; the lower is in the possession of Mr. C. Dubois, who is continually adding to his fine and valuable collection. It is almost unnecessary to contradict the opinion of some writers who have fancied this a _fresh-water_ shell. It is not uncommon, but seldom seen in perfection. * * * * * Pl. 75 [Illustration] NATICA spadicea, _Banded Natica._ * * * * * GENERIC CHARACTER. _Testa subglobosa seu ovalis, umbilicata. Spira depressa, brevissima. Columella umbilici medio terminans. Apertura semiorbicularis, operculo corneo vel testaceo clausa. Animal marinum, pede maximo; oculis ad basin duorum tentaculorum simplicium positis._ Typus Genericus _Nerita Glaucina_ Pennant. Shell nearly globose, or oval, umbilicated. Spire depressed, very small. Columella terminating in the middle of the umbilicus. Aperture semi-circular, operculum either horny or testaceous. Animal marine, with a large foot; the eyes placed at the base of two simple tentacula. Generic Type _Nerita Glaucina_ Pennant, &c. * * * * * SPECIFIC CHARACTER. _N. testa sub-globosa, fusca, albo fulvoque fasciata, juxta suturam striata; labio exteriore supra leviter emarginato; umbilico magno, aperto; columella obsolete terminante._ Shell sub-globose, striated near the suture, brown, banded with white and fulvous; outer lip above slightly emarginate; umbilicus large, open; pillar termination nearly obsolete. _Martini_ 5. _pl._ 187. _fig._ 1872 _&_ 3. _fig._ 1874 & 5? _pl._ 188. _fig._ 1896, 8 _&_ 9. _Seba_, _pl._ 38. _fig._ 66. _pl._ 41. _fig._ 14, 15. * * * * * The Shells of this genus are composed of such of the Linnaean _Nerits_ as are umbilicated, from which latter they essentially differ, both in the organization of the animal and the construction of the shell, which is either closed by a shelly or horny operculum.