LYMN.EZIDA OF NORTH AMERICA. 253 
bution of this tiny species that no generalization can be made at this 
time. It may ultimately be found to inhabit the greater part of the 
United States east of the Rocky Mountains and west of the Alle- 
ghanies, and to be coextensive with Galba parva. 
RECORDS. 
Arizona: Ash Canyon, Huachuca Mts., 5000 ft. alt., Cochise Co. (Ferriss 
and Daniels). 
Inurno1s: Rockford, Winnebago Co. (Hinkley); Copperas Creek (E. 
Hall) ; Northern Illinois, in drift (Sterki). 
InpIANA: Lake Maxinkuckee, Marshail Co. (Bartsch) ; Arlington, Mar- 
shall Co.; Waterford and Little Kankakee River, La Porte Co.; Marsh, west 
side Lake James, Steuben Co. (Daniels). 
Towa: Lost Island Lake and swamps, Ruthven, Palo Alto Co. (Walker). 
Kansas: Lawrence, Douglas Co., in greenhouse; Tecumseh, Shawnee Co. 
(Hanna). 
MicHIGAN: Gratiot, Isabella, Kent, Marquette, Montcalm, St. Joseph, Tus- 
cola and Washtenaw Counties (Walker). 
Montana: Great Falls, Cascade Co. (Bailey); Beaver Creek, Mingus- 
ville and Wibaux, Dawson Co. (Squyer). 
New Mexico: Flood debris, Arroya Pecos, Las Vegas, San Miguel Co. 
(Cockerell) ; drift of Rio Grande, Paraje, Socorro Co. (Cockerell). 
Oxu10: Between Dover and Rocky River, near Cleveland, Cuyahoga Co.; 
Put-in-Bay Island (J. A. Allen); Cartalea, Erie Co., in creek near depot 
(Sterki). 
GEOLOGICAL RANGE: Pleistocene. 
Marl beds of Arnolds Lake, Washtenaw Co., Michigan (Walker). 
EcoLtocy: Found in situations similar to those occupied by Galba 
parva. 
Remarks: This little species, the smallest of our American 
Lymneas, is related to Galba parva, appearing at first sight to be a 
small example of that species. It differs from parva in its smaller 
size, rounder and more turreted whorls, slendercr outline, longer and 
narrower aperture and smaller and less conspicuous umbilicus. The 
whorls are inclined to be shouldered, also, a feature not emphasized 
in parva. There is some variation in the length of the spire, many 
specimens having a rather long spire, while in others the spire is much 
depressed and the whorls are humped, this last being in slightly ab- 
normal forms. The inner lip of dalli is different from that of parva, 
being generally more erect; in dalli there is also a denting in or con- 
striction at the point of juncture of the inner lip and the parietal 
wall which is not notably apparent in parva. 
In the Nautilus (XX, p. 52) this species was described as the 
parva of Lea, but a careful study of Lea’s types in the Smithsonian 
Institution makes it evident that it is not that species, but a new one 
