386 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



In a set of more than one hundred specimens collected near Win- 

 terset nearly one-half are lemon yellow, and the remainder are a 

 lighter dull red than is usual. In a number of the latter the color 

 of the body whorl shades into yellow towards the aperture. 



Most of the shells from other Iowa localities are dull-red, often 

 with the body-whorl lighter towards the aperture, and but few in 

 large sets are yellowish or horn-colored. So far as is known 

 no other locality presents the variation in color reported by Wether- 

 by. Describing his Roan Mountain, North Carolina, specimens he 

 says :^ "I have found the species somewhat rarely. The shells are 

 more carinate than the typical occulta, and of all shades of color, 

 varying from bright yellow to greenish, through darker shades to 

 brown and red." Walker and Pilsbry^, who found the species 

 sparingly on Mt. Mitchell, seventy-five miles southwest of Roan 

 Mountain, report that "there was no apparent tendency to the great 

 variation in color noted by Wetherby in the Roan Mountain speci- 

 mens." It is evident that the color variation is very local. 



For the benefit of those who may not have access to the earlier 

 papers, and as a convenient summary, the localities in which the 

 species has been found living are here recapitulated : 



Minnesota : Stockton ; Winona. 



Wisconsin: Sheboygan; White-fish bay north of Milwaukee; De 

 Pare. 



Iowa : Hardin county, near Eldora ; Linn county, north of Cedar 

 Rapids ; Johnson county, north of Iowa City ; Howard county, 

 northwest corner, along Upper Iowa river ; Winneshiek county, Ply- 

 mouth Rock, Kendallville, BlufTton, Decorah, etc. ; Allamakee 

 county, along the Upper Iowa ; Clayton county, southcentral part ; 

 Dubuque county, northwest corner ; Delaware county, northeast 

 corner ; Lee county ; Madison county, southwest of Winterset. 



Illinois : Mound county, near Athens. 



Pennsylvania : Western part, Alleghany county. 



Virginia : Lexington ; Natural bridge. 



North Carolina: Roan Mountain; Mitchell. 



Tennessee : South Pittsburgh, Marion county ; Harriman. 



FOSSIL FORMS. 



As has been previously noted the fossils are more generally 

 distributed than the recent forms. They are usually found only in 



'A. Q. Wetherby, Jour. Cincinnati Society of Natural History, vol. XVII, 

 p. 77, 1894. 



•The Mollusca of the Mount Mitchell Region, North Carolina: Proc. of 

 the Academy of Natural Sciences of Philadelphia, 1902, p. 421. 



