%8 THE CHICAGO ACADEMY OF SCIENCES. 
SAND AND GRAVEL DEPOSITS. 
stagnalis appressa. caperata. palustris. 
columella. humilis modicella. catascopmum. 
obrussa. 
UNCLASSIFIED DEPOSITS. 
obrussa decampi. palustris. reflexa, 
FLORENCIA FORMATION, 
humilis modicella. obrussa. 
LOESS.” 
stagnalis appressa. parva. obrussa, 
columella chalybea. humilis modicella. palustris. 
caperata. reflexa. 
SPECIES IN DEPOSITS 
ASSOCIATED WITH MASTODON REMAINS. 
humilis modicella. caperata. obrussa. 
SPECIES IN DEPOSITS OUTSIDE ENGLACIATED AREA. 
MARL DEPOSITS. 
stagnalis appressa. humilis modicella. ovrussa. 
; palustris. 
CHARCOAL ZONE, NEW MEXICO, 
bulimoides cockerellhi. 
INTERGLACIAL BEDS. 
(Don Valley and Cayuga Lake.) 
obrussa. palustris. catascopium. 
PLIOCENE BEDS. 
obrussa. 
UNCLASSIFIED DEPOSITS. 
parva. humilis modicella. obrussa. 
palustris. 
DISTRIBUTION OF PRINCIPAL DEPOSITS IN WHICH FOSSILS 
OCCUR. . 
ENGLACIATED AREA. 
Mar! Deposits. Michigan, Wisconsin, Illinois, Indiana, South Dakota, 
Maine, Ontario, Canada. 
Clay Deposits. Illinois, Indiana, Ontario. 
Sand and Gravel Deposits. New York, Illinois, Ontario. 
Florencia Deposits. Illinois. 
Loess Deposits. Indiana, Illinois, Iowa, Nebraska, Kentucky, Ten- 
nessee, South Dakota, Missouri. 7 
Interglacial Deposits. Don Valley, Toronto and Cayuga Lake, N. Y. 
1A number of Lymnzas have been reported from Loess deposits without 
indication of the species. Such are found in Pacific R. R. Report, III, pt. 4, p. 
22, 1856 (Red River, 26 miles above Fort Washita, Kansas); Owen’s Survey of 
Kentucky, p. 18, 1856; Safford’s Geology of Tennessee, p. 434, 1869 (Shelby, 
Tipton, Lauderdale, Dyer and Obion Counties); Broadhead, Amer. Geol., XXIII, 
p. 395, 1904 (Missouri Loess). Several of these records may not be in true 
oess. 
a 
