JUN 7 = 1907 
INTRODUCTION 
The following catalogue of Ohio Mollusca, an abstract of 
my hand list, is published at the request of conchologists, and 
of members of the Ohio Academy. As indicated by the title, it 
is a preliminary one, imperfect, and not complete either as to 
the species and forms occurring in the state or as to their distri- 
bution. It is based partly on earlier lists, especially those of the 
wmeniiy of Cmcmnat, by Shaffer, Byrnes, ““O. G, B.” Harper 
and Wetherby, and partly on recent collecting in several counties 
by other conchologists, and my own collecting of over twenty 
years, in various parts of the State. The only vicinities worked 
up fairly well, and of which approximately complete lists have 
’ been published, are those of Cincinnati, a classical collecting 
ground for nearly a century, and New Philadelphia, Tuscarawas 
County. Much careful collecting has been done also in the 
vicinity of Columbus, since the forties of the last century, by 
Moores, Higgins, Surface and others, but only a very incomplete 
catalogue of the land mollusca has been published. The late 
Geo. W. Dean and his friend, Geo. J. Streator (now in California), 
have collected principally in Portage County, A. Pettingell 
in Summit Co., John A. Allen in the vicinity of Cleveland and on 
the lake islands, and E. L. Mosely at Sandusky. 
It is expected that more students of nature, in all parts of 
the state, will direct their attention to, and collect our land and 
fresh-water mollusca, recent as well as fossil, wherever such can 
be found. Very much work is yet to be done, and these animals 
are of great interest, especially with respect to zoogeography. 
Then the time will come when it 1s possible to work up a more 
complete and elaborate ‘‘fauna’”’ of the state, with more data on 
the distribution over the main drainages, and the various kinds 
of soil and surface formation, with tables, charts, etc. Also 
closer comparison with the faunas of neighboring states will 
then be in place. Earlier work and earlier lists will be reviewed, 
and literature cited. 
During recent years, mollusk lists have been published of 
the States of New York, Michigan, Indiana, Illinois and Wiscon- 
sin, and local lists of Pennsylvania. None of them pretends to 
be complete; yet, with Ohio added, they facilitate a fair con- 
ception of the fauna of this part of the continent. 
Ohio, being in the Interior Region of the Eastern Sub- 
province (W. G. Binney) of the Nearctic Province, has that 
characteristic fauna, in a general way. Yet there are some 
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