PHYSADA. 838 
Family PHYSAD4, Haldeman. 
Monog. Physa, p. 5, 1842. 
GENERA. 
1. Shell oblong, spiral, aperture oval, entire 
below. 
Subfamily Limn.zn az. 
Dextral, spire more or less elongated, 
Limn za, Lamarck. 
Sinistral, oblong. Margin of the mantle 
fringed, ; . Paysa, Draparnaud. 
Sinistral, oval-elongated. Mantle-margin 
simple, . ' . Butinus, Adanson. 
2. Shell turbinate, spiral, not umbilicated, 
whorls gibbosely rounded. 
Subfamily Pompyouicinz£, Dail. 
PompHotyx, Lea. 
3. Shell turbinate, spiral, umbilicate, whorls 
angulated and carinated. 
(57) 7 
