318 THE CHICAGO ACADEMY OF SCIENCES. 
American Conchology. No specimens have been seen from this lo- 
cality. When better understood, desidiosa will probably be found to 
inhabit a much wider range than here indicated. 
RECORDS. 
InpIANA: New Harmony, Posey Co. (Leseuer, Say). 
New York: Small stream under Erie Canal, Western Wide Waters, 
Rochester, Monroe Co.; near Geneva, north end Seneca Lake, Ontario Co. 
(Baker); Cayuga Lake; Falls of Niagara, Erie Co. (Say); Young’s Quarry, 
Williamsville, Erie Co. (Miss Walker). 
PENNSYLVANIA: Pennsylvania (Say). 
GEOLOGICAL DisTRIBUTION: Unknown. 
Ecotocy: Dead specimens were found along a marshy reed- 
bordered shore in Seneca Lake; Miss Waiker found it in an old quarry 
at Williamsville. 
REMARKS: An examination of Say’s specimens of desidiosa in 
the Academy of Natural Sciences of Philadelphia reveals the fact that 
all subsequent naturalists have misunderstood this species and have 
given the name to a species belonging to a different group of Lymnzas. 
The true desidiosa is a member of the palustris group, as shown by 
Say’s specimens and by a close study of Say’s description and figures. 
The two specimens in the Philadelphia Academy may be described as 
follows :* 
Shell oblong-ovate, rather solid, color pale horn; surface dull, lines 
of growth crowded, conspicuous, crossed by impressed spiral lines; 
whorls 514, convex; the body whorl is quite convex; spire acutely 
conic, about as long as the aperture; sutures well impressed; apex of 
11%4 whorls, brownish horn; aperture long-ovate; outer lip thin, with 
an internal rib or varix; inner lip reflected over and appressed to the 
parietal wall, leaving a small umbilical chink; columellar axis with a 
distinct, thick plait. 
Length. Breadth. Aperture length. Breadth. 
15.00 7.50 8.00 3.00 mill. 
14.25 7.50 Tate Se 0N 
The specimens bear the following label in the original handwriting: 
Eymnea desidiosa Say. Journ. Acad. V. 2, p. 169. T. Say, Penn.? 
(No. 58731.) 
The figure in Binney (fig. 68) is said to be from an authentic 
specimen in the Philadelphia Academy, but no such specimen is now 
in existence, nor are the specimens mentioned from Cayuga Lake to 
be found. In the absence of any other authentic material, it would 
seem that Say’s specimens must be taken as typical of desidiosa. A 
1The specimens are somewhat narrower than Say’s figures in Amer. Conch, 
