326 THE CHICAGO ACADEMY OF SCIENCES. 
Iowa: Missouri River, in the vicinity of Council Bluffs, Pottawattamie 
Co. (Say). 
MicuicAN: Grand Rapids, Kent Co. (Currier; McNeil); Stoney Creek, 
Monroe Co. (Sister Mary Katherine) ; East Saginaw, Saginaw Co. (Lathrop) ; 
Ecorse and Greenfield, Wayne Co.; Higgins River, Roscommon Co. (Walker) ; 
Galien River, New Buffalo, Berrien Co. (Webster). 
Minnesota: Ponds, southern Minnesota (Shimek). 
New Jersey: White Pond, Sussex Co. (Pilsbry and Rhoads). 
New York: South Ogden Street pond, Buffalo, Erie Co. (Letson) ; Chip- 
pewa Creek, Erie Co. (Letson; Miss Walker); Sacketts Harbor, Jefferson Co., 
Lake Ontario (Phil. Acad) ; Canandaigua Lake, Ontario Co. (Say); Litchfield, 
Herkimer Co. (Walker). 
Ouro: Shore of Johnson's Island, near Sandusky, Erie Co.; pool at 
Linndale, near Cleveland, Cuyahoga Co. (J. A. Allen); Cincinnati, Hamilton 
Co. (Anthony; Shaffer) ; Toledo, Lucas Co. (F. A. Bossard) ; Columbus, Frank- 
lin Co. (H. Moores); Miami Canal, Lockland, Hamilton Co. (Walker). 
SoutH Dakota: Brookings Co. (P. C. Truman). 
Wisconsin: In pool, Johnson’s woods, near National Soldiers’ Home, 
Milwaukee, Milwaukee Co. (C. E. Brown); Lake Mendota, Dane Co. (C. 
Judey) ; Madison, Dane Co.; Kenosha, Kenosha Co. (Mrs. Wiswall). 
BRITISH AMERICA. 
Ontario: Rainy Lake and Seine River, Rainy River Dist. (Say). 
GEOLOGICAL RANGE: Not differentiated by authors from that of 
palustris. 
Ecotocy: Inhabits ponds and sloughs which become more or less 
dry in summer. 
Remarks: Elodes differs from palustris in having more loosely 
colled whorls and in being narrower and more attenuated, with more 
fiat-sided whorls. The spire is very narrow and considerably longer 
than the aperture. In narrow specimens of both species, elodes is seen 
to have a longer and more compressed body whorl and a narrower 
and longer aperture. In the majority of cases elodes is easily sepa- 
rable from palustris, the whorls of elodes being comparably longer than 
in palustris, though not as long as in reflexa. 
This is the form which is frequently confounded with reflexa and 
which has caused the statement to be so frequently made by writers 
that “palustris runs into reflexa.’ In reflexa the body-whorl and the 
penultimate whorl are normally very long in comparison with their 
haght; they are usually (in the typical form) flatly rounded and 
oblique; the first to the fourth whorls are very small and regularly 
increase, while the. fifth to seventh whorls increase disproportionately 
in size; in elodes all of the whorls have usually a regular increase. 
The upper whorls of reflexa also have a puffy appearance, while those 
of clodes are more evenly rounded. The aperture in reflera is very 
different, being strongly reflexed and “‘bayed”’ just below the columellar 
