HELIX. 123 



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

 of an inch. 



GEOGRAPHICAL DISTRIBUTION. Inhabits Arkansas, 

 in the region of the Washita Springs. 



REMARKS. Its general aspect is that of H. 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. H. 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. H. columbiana is much 

 more globular, smooth, with the umbilicus open, and 

 also with a sinus to the lip. [G.] 



14. HELIX POLYCHROA, BlNNEY. 

 PLATE XLVI, XLVII. 



H. testa solidula, arete perforata, globoso-conica, striat- 

 ula, laevi, versicolore, alba, fuscescente, virescente, vel 

 rubescente, unicolore vel fasciis variis nigricantibus cincta ; 

 apice et labiis semper rosaceis ; spira elevata, anfractibus 

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

 culari, peristomate acuto, reflexiusculo, intus incrassato, 

 portione columellari dilatato, planulato ; fauce plerumque 

 rosaceo. 



SYNONYMS AND REFERENCES. 



Helix wbmeris, MIGHELS, Proc. Bost. Soc. Nat. Hist. 1. 187. 



