This genus contains shells found in fresh water. Shell sub-discoid or
conoid, umbilicated, spiral whorls rounded; summit papillose; aperture
round, not modified by the last whorl; the edges completely united,
sharp; operculum complete, horny, and orbicular.
_V. piscinalis._ The Pond Valvata. Pl. 20, fig. 5.
Small, globular, conoid, deeply umbilicated; summit obtuse; wrinkled
longitudinally, covered with a yellowish epidermis.