64 CONCHOLOGIA CESTRICA. 
Sub-genus LIMNOPHYSA, FI?zinceEr, 1833. 
Shell, ovate-oblong; whorls rounded; spire conic, 
about as long as the aperture; outer lip not spreading. 
L. catascopium, Say. 
Lymnea catascopium, Say, Nich. Ency., 
LL, catascopium. 
[W. G. B.] Aimer, Ed) ren: 
Fig, 121, 
Shell, horn color, or reddish; whorls 
4-5, first large; the spire darker, acute; 
aperture large, oval, less than three-fourths 
the*leneth “of the shell’; Ge 1s, 5We a2: 
mill. 

Lingual Dentition of L. catascopium. — [W. G. B.] 
Fig, 122, 

{gH XLOOWOOOW \ 
nmi) mac 
ANY! 
2 as 
Station, Delaware and Schuylkill Rivers; abundant. 
L. elodes, Say. — 
Lymneus elodes, Say, Jour. Acad. Phila. F. 5., I., 
1821. 
a Se Shell, oblong-conic, thin; whorls 5, regularly 
Fic.123, rounded; in some instances, the lines of growth, 
with the revolving striz, produce, by their de- 
cussation, numerous small facets; suture mod- 
erate; umbilicus slight ; aperture sub-oval, less 
than half the length, often reddish, and slightly 
thickened, within. H. 20, W. 9, mill. 
Station, Schuylkill River; Chester County. 
Ops. — The variable character of this species is doubt- 

less, in a measure, due to the differences of station. 
