. Cuvier's animal kingdom : arranged according to its organization. Animals. 360 The Ampullaria, Lam.— Has a roundish ventricose shell with a short spire, like most of the Helices ; its apertm-e is higher than wide, furnished with a [calcareous] operculum, and the columella umbili- cated. They live in the fresh and brackish water of hot climates. The animal has long tentacula, and pedunculated eyes. At the bottom of the respiratory sac, by the side of the long branchial comb, there is, according to the observations of MM. Quoy and Gaymard, a large pouch filled with air, and which ma
. Cuvier's animal kingdom : arranged according to its organization. Animals. 360 The Ampullaria, Lam.— Has a roundish ventricose shell with a short spire, like most of the Helices ; its apertm-e is higher than wide, furnished with a [calcareous] operculum, and the columella umbili- cated. They live in the fresh and brackish water of hot climates. The animal has long tentacula, and pedunculated eyes. At the bottom of the respiratory sac, by the side of the long branchial comb, there is, according to the observations of MM. Quoy and Gaymard, a large pouch filled with air, and which may possibly be a swimming bladder. Tlie Lanistes, Montf., are Ampullarise with a wide spiral umbilicus.—Tlie Heli- lina, Lam., from the shell, would seem to be AinpuUariœ with the rim of the aper- ture reflected. When this rim is sharp, the shells are Ampullines, Blainv., and when it is blunt, the Oli/pira of Say. There is one species (Helicina neritella, Lam.) remarkable for a white shelly edge on the inner side of the operculum. It appears that the organs of respiration are similar to Cyclostoma, and that the ç 174 -Ampullar i ru^os i animals can live in the open air. [ The Helicinae are land shells. Mr. Gray has given amonograph of the genus in the 1st vol. of the Zoological Journal; but since its publication, the number of species has been doubled.] The Melanije— Have a thicker shell, with the aperture deeper than wide, which expands at the part opposite the spire. The columella has neither fold nor umbilicus. The spire varies greatly in its length. They live in rivers, but there is no species in France. The animal has long tentacula, and the eyes are placed about a tliird way up on their outer side. The Rissoa, Freminv. (Acmea, Hartm.) differs from Melania in having the rim of the aperture united all round. [" All we have met with are littoral shells, and several species abound on our s\iore&.''—Sowerby.—Melanopsis, Ferussac, with nearly the same for
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