80 



ZONITIDAE 



from only the northern part of the 

 state, Will County and north. 



A common species rather widely 

 distributed in Europe, Asia and in 

 North America, Zonitoides nitidus 

 is thought to have been introduced 

 artificially into the United States, 

 but its wide distribution might sug- 

 gest that it is a circumboreal species 

 like very many of our other North 

 American land snails. It ranges in 

 North America from New England 

 westward to the state of Washing- 

 ton, and from the northern part of 

 Canada southward to Pennsylvania and Ohio. A record from 

 Baldwin County, Alabama, is founded probably upon specimens 

 artificially introduced on plants. 



ZONITOIDES LIMATULUS ("Ward" Binney) 



The rather rare snail Zonitoides limatulus has a greenish- 

 white shell about one-fourth inch (5 mm.) in diameter and 

 usually of 4^ whorls. The spire is depressed, the height of the 

 shell being less than half the diameter. The flattened base of 

 the shell has a very wide and shallow 

 umbilicus. 



The sculpture of the whorls con- 

 sists of conspicuous parallel lines of 

 growth which appear much like thread 

 wound upon a spool. These lines are 

 much coarser on the spire than on the 

 base of the shell. This species is easily 

 identified by its color, by its very wide 

 umbilicus, which shows all of the 

 whorls, and by its peculiar, threadlike 

 sculpture. 



This species is known at present 

 only from Clark, Washington and Hamilton counties, all in the 

 central or southern parts of the state. In Clark County, 

 Zonitoides limatulus has been found living under logs in a rocky 

 ravine, in a forest of oak, hickory, elm and sycamore. 



