342 New species of Fresh Water Shells. 
nacre waxen yellow, anne on the margin, whichis pony white and 
highly iridescent. 
Cycnuas stTaminea. PI. 1. fig. 5 
Shell oval, ventricose, inequilateral; with numerous regular prom- 
inent concentric lines ; beaks slightly prominent; anterior and poste- 
rior ends nearly equally rounded ; cardinal teeth none; lateral teeth 
distinct. : 
Inhabits small streams in South Alabama. Figure of the natural 
size. Cabinet of the Academy of Natural Sciences of Philadelphia. 
‘Shell oval, regularly convex ; inequilateral ; anterior and posterior 
ends similarly rounded ; auc inflated ; beaks .a little prominent, 
apex obtusely rounded; epidermis yelidwshs with darker stains; 
lateral teeth rather prominent ; nacre bluish white; cavity capacious. 
Me.ania OLIVULA. Pl. I. Fig. 13. 
Shell oblong or narrow-elliptical, smooth and entire; spine con- 
ical; volutions five ; suture impressed ; aperture somewhat elliptical, 
longitudinal ; about ‘half the length of the shell, color green olive; 
with strongly marked brown revolving bands; about 4 on the body 
whorl. 
Var, A. Much more elevated, with a uneed or eroded apt ; 
the whorl flattened, and the spine less conical. _ 
Observations. Inhabits the Alabama river, adhering to the sof 
calcareous banks, which it perforates in such a manner that they re- 
~ semble honey comb, or wood pierced by Teredo navalis. a 
Meania prasinata, Pl. 1. Fig. 14. 
Shell subulate, slightly turrited ; whorls 7 or r 8, flattened ; aperture 
elliptical, alittle oblique ; about one third of the length of the shell ; 
body whorl sub-angulated at base ; epidermis green olive. 
Var. A. with broad revolving eats, those on the body whorl cre- 
nulated. 
‘ Inhabits Alabama river, adhering to limestone rocks. Cabinet of 
the Academy of Natural Sciences of Philadelphia. ts 
Ancutosa picta.” Fig. 15. . 
Shell sub-oval, shoulder obtusely rounded; aperture obovate, 
large; columella callous above; epidermis. olive, with numerous 
quadrangular small spots disposed in revolving lines, strongly mark- 
ed in the aperture. 
