140 



SPECIES INTRODUCED 



on the back, sometimes whitish 

 toward the end. The body is 

 long and narrow; the shell is 

 placed well toward the posterior 

 part. The tentacles are short, 

 and the eye peduncles long and 

 slender. In Illinois, cellarium is 



known only from greenhouses in Chicago and Rockford. 



This species has been known previously as Zonites cellaria 



and Vitrea cellaria, as well as Oxychilus cellarius. 



OXYCHILUS LUCIDUM (Draparnaud) 



The introduced species Oxychilus lucidum is larger than 

 Oxychilus cellariu?n and the spire is more nearly flat. The shell 

 of most lucidum specimens measures about one-half inch (12.5 



mm.) in diameter. The body 

 whorl is wide and expanded, 

 which causes the aperture to be 

 wider than high. The base of 

 the shell is more nearly flat and 

 the last whorl and the umbilicus 

 are w^ider than in cellarium. The shell is of the same yellowish 

 color and shining texture as that of cellarium. 



Both species of Oxychilus described here are common in 

 Europe. The larger species is known in Illinois only from the 

 greenhouses in Chicago parks. 



OPEAS MAURITIANUM (Pfeiffer) 



The small snail Opeas mauritianum, an emigrant from the 

 Island of Mauritius, off the coast of Africa, may be known 



by its long spire of 7 

 whorls, its small aper- 

 ture and its yellowish 

 color and shining tex- 

 ture. Specimens of this 

 species vary in size, av- 

 eraging about one-half inch (11.0-12.5 mm.) in length. 



In Illinois it has been found only in the greenhouses of 

 Chicago parks. 



