The Nautilus. 



Vol. XXIX, MARCH, 1916. No. 11 



MOLLUSKS OF GENEVA, OHIO. 



BY V. STERKI. 



About a mile and a half north of Geneva, Ashtabula county, 

 Ohio, in the northeast corner of the state, and about three 

 miles from Lake Erie, there are some low woods, an ancient 

 lake-bottom land. The soil is a sandy clay, and at some places 

 mucky. During spring, the lower parts are more or less cov- 

 ered with water ; in summer, the soil often becomes dry as a 

 bone, for weeks and even months. 



From 1909 to 1915, I had chances to do more or less collect- 

 ing there every year, and at various seasons. The following 

 list may be of some interest, for being approximately complete, 

 and for some notes on ecology, etc. Some species found on the 

 open land near those woods, and originally part of them, are 

 added and marked with a *. The species are numbered for 

 easy reference. 



1. Gastrodonta intertexta Binney, common especially at low 

 places where Sphap/rium occidentale and Succinea oralis are living, 

 and on which probably they are principally feeding. 



2. Zonitoides arboreus Say, common. 



3. Z. minusculus Binney, frequent. 



4. Z. exiguus Stimpson, common at some places. 



5. Z. milium Morse, scarce. 



6. Omphalina fidiginosa Griffith, not common, and apparently 

 quite scarce in the last years. 



