HELIX. 123 



Diameter three-fourths of au inch ; axis three-tenths 

 of an inch. 



Geographical Distkibution. Inhabits Arkansas, 

 in the region of the Washita Springs. 



Remakes. Its general aspect is that of ^. appressa. 

 On a closer examination it is found to be thinner, more 

 coarsely ridged, and a little more globular. The aper- 

 ture is larger, more rounded, and destitute of a tooth ; 

 the lip is peculiarly flexuous. The umbilical region is 

 the same. S. dentifera is still more like this in form, 

 but it has also a tooth, and its surface is minutely granu- 

 lated by fine decussating lines. S. columbiana is much 

 more globular, smooth, with the umbilicus open, and 

 also with a sinus to the lip. — [g.] 



14. HELIX POLYCHROA, Binney. 



Plate XLV(., XLVII. 



H. testa solidula, arete perforala, globoso-conica, slriat- 

 ula, Isevi, versicolore, alba, fuscescente, vcrescente, vel 

 rubescente, unicolore vel fasciis variis nigricaniibus cincta, ; 

 apice et labiis semper rosaceis ; spira elevata, anfractibus 

 5-6 convexis ; basi convexiuscula ; apertura parva, sub-cir- 

 culari, peristomate acute, reflexiusculo, intus incrassato, 

 portione columellari dilatato, planulato ; fauce plerumque 

 rosaceo. 



SYNONYMS AND EEFEKENCES. 



Helix SKbmeris, Mighels, Proc. Bost. Soe. Nat. Hist. 1. 187. 



