276 AMPULLARIIDA. 
produced into two long tentacular processes ; tentacles extremely 
elongated, slender. Dentition (xi, 22,23). Inhabits lakes and 
rivers throughout the warmer parts of the world, retiring deep 
into the mud in the dry season, and capable of surviving a 
drought, or removal from the water for several years. In the 
Lake Mareotis, and at the mouth of the Indus, eee are 
abundant, mixed with marine shells. Their eggs are large, 
enclosed in caleareous capsules, and aggregated in elobular 
masses around the stems of plants, etc. 
These fluviatile mollusks represent in the ponds and rivers of 
the tropics, the Paludinz of more temperate climates. Although 
distinct gills exist, the respiratory cavity is very large and 
partly closed, so as to enable these animals to live a long time 
out of water; in fact, they appear to be truly amphibious. 
AMPULLARIA, Lam. 
Apple-snail. #fym.—Ampulla, a globular flask. 
Syn.—Pachylabra, Swains. 
Distr —150 sp. Tropical, in fresh water. West Indies, Cen- 
tral and South America, southern portion of the United States, 
Africa, India, East Indies. A. ampullacea, Linn. (Ixxiv, 15). 
Shell globular, with short spire; epidermis green, polished, 
sometimes banded or spotted ; usually umbilicated. 
Lypical.—Aperture slightly thickened within the margin. 
Opereulum with an inner calcareous layer. Oriental exclusively. 
SAULEA, Gray. Shell ovate, subglobose, very thin, parchment- 
like, elastic, dark-colored, variegated, covered with a very thin, 
hard, olive epidermis; upper whorls minutely keeled, others 
rounded; axis imperforate. Operculum thin, shelly, elastic. 
Sierra Leone. A. vétrea, Gray. 
pomus, Humphrey. Differs from Ampullaria in the absence 
of a thickened internal ledge of the lip, and in the operculum 
being entirely horny. American exclusively. A. canaliculata, 
Lam. (Ixxiv, 16). 
POMELLA, Gray. Shell suboval, solid,not umbilicated ; whorls 
striated, the last very large ; spire very short or depressed ; 
aperture very large; peristome thin, expanded. Opereulum 
horny. South America. A. neritoides, d’Orb. (xxiv, 17). 
ASOLENE, d’Orb. 
Syn—Ampulloidea,d’Orb. Ampullaroides, Gray. 
Distr.—South America. A. Platz, d’Orb. (1xxiv, 18). 
Shell subglobular, spire slightly elevated ; aperture oval; the 
inner lip somewhat thickened, forming a continuous peristome. 
Operculum corneous, with an inner calcareous layer. Animal 
without a Jong respiratory siphon. 
