126 PHYSA. 
PuyseLta, Haldeman. Shell globose, spire 
short; aperture elongate, very wide; columella 
with the fold well marked. 
The peculiar globosely inflated form of this 
genus recalls forcibly the genus Amphipeplea, 
from which it differs principally in being sin- 
istral. 
Puysopon, Haldeman. Shell solid, smooth, 
elliptical ; outer lip thick ; columella toothed. 
IstporaA, Ehrenberg. Shell ovate, wmbih- 
cated ; columella without a fold. 
Ameria, H. Adams. Shell with the whorls 
flattened, and angulated or carinated at the 
posterior part (spire) ; spire short, depressed. 
This subgenus, proposed in 1861 for a group 
of Australian species, may also receive a single 
American species, Ph. scalaris, Jay. 
CostaTELLA, Dall. Shell oblong, covered 
with longitudinal elevated equidistant ribs. 
Soft parts unknown. 
(42) 
