114 LIMNZA. 
aperture, which is proportionally much longer 
and narrower, and in being only about half 
their size. 
Subgenus ACELLA, Hald. 
36. LIMNAA HALDEMANTI, Deshayes. 
Limnea gracilis, Jay. Hald. Monog. 50, t. 13, fig. 21. 
Inhabits from Lake Champlain to Michigan. 
Spurious Species. 
LiunzA ruGosA, Val. Hald. Monog. 15, t. 3, 
f. 4, 5. 
This is a Bulimus, probably from Mexico or 
South America. The localities in Valenci- 
ennes work are frequently very erroneous, 
and but little dependence can be placed upon 
them. 
(88) 
