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LYMNEIDZ OF NORTH AMERICA. 109 
Locatity: Nashotah, Waukesha County, Wisconsin. 
Remarks: Nashotahensis was at first thought to be a form of 
Galba daniclsi; it differs markedly from that species, however, in sev- 
eral particulars—the spire is broader and not so acute, the body whorl 
is larger and inclined to be gibbous, there is a conspicuous umbilical 
chink (danielsi is usually imperforate) and the columella is not notice- 
ably plicate. In nashotahensis the aperture is elongate ovate, narrowed 
above and broadened below where it is often patulous. The upper 
whorls are strongly suggestive of Galba reflexa, the penultimate whorl 
having the swollen appearance so characteristic of refleva. 
Young specimens somewhat resemble Galba catascopium, differing 
in being narrower, with a more elongate aperture, longer and less 
rounded whorls and a less distinctly plicate columella. There is also 
an umbilical chink which is usually absent in catascopium. Certain 
specimens from the marl beds at Kegobic, Michigan, seem referable 
to this species. Nashotahensis was probably contemporaneous with one 
of the glacial stages of the Great Lakes. 
Like Walker’s Galba bakeri from Michigan, nashotahensis is an 
extinct species peculiar to the marl deposits. The specimens were se- 
cured by Mr. F. M. Woodruff. 
DOUBTFUL LYMNAS AND SPECIES WRONGLY REFERRED TO THIS FAMILY. 
There have been a number of references to the occurrence of 
Lymnea in Mesozoic and Tertiary strata, where the determinations ap- 
parently have never been made. There are also several cases in which 
the species, on more careful examination with additional material, 
have been found to belong to another family of mollusks. These are 
listed below. 
Lymnea Sp. 
Limnea? Upper Kanab, Utah; Wuirter, Rep. Geol. Uinta Mts., p. 100, 1876. 
Lymnea Sp. 
Limnea sp.? Pliocene, Cache Valley; PEALE, An. Rep. U. S. Geol. & Geog. 
Surv. Terr., XI, p. 640, 1879 (possibly the same as Meek’s Kingz). 
Lymneza Sp. 
Limnea sp., Darton, Bull. Geol. Soc. Amer., XIX, p. 446, 1908—DarToON 
and SrepenTHAL, Bull. U. S. Geol. Surv., 364, p. 30, 1909. 
Horizon: Morrison, Comanchean Period. 
LocaLity: West of Downey Lakes, in the N. W. %, Sec. 15, T. 
13 N., R. 75 W., Southern Wyoming. 
Lymneza Sp. 
Acella sp. Wuiteaves, Con. Can. Pal., I, p. 13, 1885. 
“A few fragments of an Acella were collected by Dr. G. M. Daw- 
son in 1874 and 1881. Dr. C. A. White, to whom these specimens 
