104 LIMNAA. 
ttt Species of the Atlantic Basin of the 
United States. 
21. LIMNAA DESIDIOSA, Say. 
Hald. Monog. 31 and 48, t.10,t. 18, figs. 16—18. 
L. modicella, Say. Hald., t. 18, figs. 8, 6—8. (Sub nom. 
L. humilis, Say. 
Limnea Jamesii, Lea. Plate 18, fig. 3. 
Very common in the middle Atlantic States, 
and becoming more rare westwards to the 
Mississippi River. 
The large, expanded specimens of Halde- 
man’s plate 10 belong probably to L. macros- 
toma, Say, as desidiosa is a narrow, small 
species, and I have never obtained any speci- 
mens resembling Haldeman’s figures 7, 8, 9. 
Mr. Lea’s species was collected at Cincinnati, 
Ohio. 
