10 



ao.MTiyH viieiuiJi^us, Menkk. 



(iiy. ciectrina, Goui-D.) Sliell (lepressGcl, thill, wliirls 

 three and one-half, lip simple, shell umbilicated. 

 jDia. 5 mill. Loc. Fox and TllinoiH River Valleys. 



XO.'^ITI^.S FIJI.VA, DiiAr. 



(iiciix ciier.*iina^ Say.) Shell thin, acnte, lip whirls 

 five, aperture transverse, breadth four mill. Abundant. 



SUBFAMILY HELICTNAE 



IIF.I.ICOUINCIJS, Mouse, 

 Helix lincnta. Say.— Siiell Hat, wliirls four, lijo acute, 

 witli two i)air of teeth within the aperture, horn-color, 

 breadth four mill. Very abundant. 



o k:\ijs i»A'r»;i.A, iialuic. 

 iiciix aitcrnitfa. Say.— Shell has live whirls, peris- 

 tome acute, uin])ilicus deep, shell not much elevated, 

 and variegated witli numerous reddish spots, some of 

 them oblique, otliers running into lines on last whirl, 

 diameter nearly one incli. This is the most abundant 

 species in the county ; they live in colonies of one 

 hundred or more in some localities. Abundant in a 

 semi-fossil condition iii the Quaterary deposits. 



Tlellx alternata, Say, variety. — This is a sharply 

 carinated variety with coarse strijc, resembling //. 

 mordax, Suutt. But as I believe the true mordax is 

 from Tennessee, and this is different in not having as 

 coarse stria?, I cannot call it the same. It is a well 

 marked varietv, however. 



