. Annual report of the Regents. New York State Museum; Science. NIAGARA FALLS AND VICINITY 245 Physa heterostropha Say 1821 (Fig. 174). Limnaea he- terostropha Say (1817-19. Nich. cue. Am. cd. pi. i, fig. 6). Physa heterostropha Say (1821. Acad. nat. sci. Phil. Jour. 2:172) Shell oval and smooth, sinistral; whorls four, the first large, the others very small and terminating in an acute apex; aperture large and oval, about half the length of the shell; outer lip a Httle thickened, inner lip folded back on Fis^mphysa the columella, forming a slight callus. heterostropha. Localities. Goat island,
. Annual report of the Regents. New York State Museum; Science. NIAGARA FALLS AND VICINITY 245 Physa heterostropha Say 1821 (Fig. 174). Limnaea he- terostropha Say (1817-19. Nich. cue. Am. cd. pi. i, fig. 6). Physa heterostropha Say (1821. Acad. nat. sci. Phil. Jour. 2:172) Shell oval and smooth, sinistral; whorls four, the first large, the others very small and terminating in an acute apex; aperture large and oval, about half the length of the shell; outer lip a Httle thickened, inner lip folded back on Fis^mphysa the columella, forming a slight callus. heterostropha. Localities. Goat island, Whirlpool and Foster's flats. Genus PLANORBis Guettard. 1756 The animal of P 1 a n o r b i s has a broad foot, and long slender tentacles. The shell is dextral and discoidal; the spire depressed, and the whorls numerous and visible on both sides; the aperture is transversely oval, with a thin lip. Planorbis bicarinatus Say 1817 (Fig. 175). Planorbis bicarinatus Say (1817-19. Nich. cue. Am. cd. pi. i, fig. 4) Shell sinistral; sharply carinated on both sides; all the whorls may be seen from either side; aper- ture vaulted above, angulated below; surface wrinkled with growth lines at regular distances and surrounded by fine revolving striae. earinatus.'^x2°^ ^ ' Locality. Fouud only in the gravel on Goat island. Planorbis parvus Say 1817 (Fig. 176). P. parvus Say (1817-19. Nich. cnc. Am. cd. pi. i, fig. 5). P. parvus Say (1865. Smith. Misc. coll. no. 144, p. 133) Shell small, with four whorls crossed by wrinkles or growth lines; concave above and below; body whorl Fig. ne pian- slightly swollen; mouth oblique, with the lip simple. orbisparvus. x2 Locality. Goat island and Foster's flats. Class PELECYPODA Goldfuss Genus sphaericm ScopoH. 1777 General shape of the animal oval, margins plain, united behind and ending in two short siphons, which are joined at their base; mouth oval and small; gills broad and unequal, the inner ones largest; the foot tongue-shaped, triangular, flatte
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