LIMNZA. 107 
*#%* Shell small or moderate, globosely ovate. 
26. LIMNAA CATASCOPIUM, Say. 
Hald. Monog. 6, t. 1. 
This species is most numerous in the waters 
of the Middle Atlantic States, and scarcely 
extends southwards. To the north it reaches, 
however, to the British possessions, and west- 
ward to Michigan, while the specimens re- 
ported from far western localities probably 
belong to other species; those represented by 
Binney’s figure 86 are L. solida, Lea. On the 
west coast this species is replaced by its ally 
L. Adeline, Tryon. 
The short variety (L. pinguis of Say) is nu- 
merous in the vicinity of Philadelphia; there 
is also a variety both at Mohawk, New York, 
and at Philadelphia, which by its long spire 
reminds one of L. elodes, Say (= palustris, 
Miller). 
(81) 
