1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 255 NOTES ON SOME FLORIDIAN LAND AND FRESH-WATER SHELLS "WITH A REVISION OF THE AURICULACEA OF THE EASTERN UNITED STATES. By \V. II. DAL.!^. The shells upon which the following notes are based form part of the collection of the United States National Museum, and were obtained in Florida by myself and by Dr. R. E. 0. Stearns, Mr. Henry Hemp-hill, Prof. A. G. Wetherby, Dr. Velie, and other friends and correspond-ents of the Museum. !No completeness is claimed for them, but it is hoped that the publication of these notes may stimulate others to sup-plement and correct them, until a more nearly complete knowledge of the mollusk fauna of Florida shall be reached. Additions and correc-tions will be gratefully received and suitably acknowledged in future publications. Ampullaria (Pomus) depressa Say. Plate 17, figs. 4, 5. Ampullaria depressa Say, Loug'.s Exp., p. 264, pi. siv, fig. 2, 1824. Not of La-marck. Ampullaria paludosa Say, New. Harmony Diss., p. 260, 1840. Amjjullaria liopdonensis Lea. Pomus depressa Binuey, L. & F. W. Sh. N. Am., iii, p. 3, 1865. Silver Sirring, Fla., General F. E. Spinner. Mound at Enterprise, Lake Monroe, Dall. This species is found abundantly in several of the mounds, and often much larger than anj^ recent specimens which have been received so far. It is said that Lamarck's A. depressa is a Natica^ but on the prin-ciple that " once a synonym always a synonym," it would perhaps have been better if Binney had not revived the old name, but had retained pahidosa. Ampullaria (Pomus) caliginosa ReeTe. Ampullaria caliginosa Eve. Couch. Icon. Mon. Ampullaria, fig. 118, pi. xxv, Dec, 1856. Swamps near Cedar Keys, Hemphill. This species is distinguished easily from the typical depressa by its stouter, higher, narrower shell, smaller aperture, larger umbilicus, thickened peristome, higher spire, much more roundly globose whorls, the posterior angle of the aperture not passing much behind the middle of the body whorl and often in front of it. The shell is much thicker and more solid with a salmon tinge on the margin of the aperture, the surface transversely wrinkled and malleated. The color is generally darker, the operculum is black, not brown, as in A. depressa. The spe-cies is probably common to Mexico and Nicaragua also, and may have been confounded with depressa by collectors. It has been received from Nicaragua, collected there by Bridges, Dall, and Sumichrast, and from Tehuantepec, collected by Dr. Spear, United States Navy. The name Pomus Humphrey has no standing in nomenclature, never
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