203 



obseuris volventibus insculpta ; anfr. 3 perobliquis, supernis parvulis, 

 tumidis, sutura profunda, ; apertura ovata, trientes duaj longitudinis 

 testae asquante, basi rotundata, ; columella arcuata, absque plica, 

 leviter arrecta ; intus mieante. 



Long. £ ; lat. £ poll. Hab. near Lake Concordia. 



At first view, this might be mistaken for Lirnnea columella. Its 

 color and texture are like S. amphibia, from which it differs chiefly in 

 the slight upturning of the edge of the columellar lip, the presence 

 of the obscure revolving lines, and the ruddy apex. 



Helix selenesta. T. parva, discoidea, pallida, tenuissima, exiliter 

 striata, diaphana ; anfr. 5 convexis, ultimo subangulato, sutura im- 

 pressa ; basi convexo, umbilico infundibuliformi perforato ; apertura 

 angusta, lunari, labro simplici. 



Diam. ^ poll. Hab. Georgia and Florida. 



About the size of H. arborea, distinguished by its delicacy, its pale, 

 opaline color, its small well-defined and deep umbilicus, its discoidal 

 spire and its narrow aperture. Its color and superior aspect may be 

 compared with H. lineata. [Compare H. vortex.'] 



Helix rotula [Capsella]. T. parva, discoidea, pellucida, nitida, 

 electrina, H. suppresses siniili, umbilico infundibuliformi profundo 

 perforata ; anfr. 6J, vix convexis, striis distantibus superne impressis, 

 sutura marginata ; apertura semilunari, labro simplici, baud incrassato. 



Diam. \ poll. Hab. Tennessee. 



This delicate little species has the size and color of H. indentata, 

 and is similarly striated above ; the whorls are numerous and closely 

 convoluted Uke H. suppressa, but it has a larger umbilicus, like H. 

 lasmodon, and has no thickening or plate within the aperture. 



Helix maxillata. T. parva, globoso-lenticulari, pallide casta- 

 nea, solidula, II. hirsulce simili : apertura lineari, labro reflexo, praater 

 emarginationem inconspicuam dente obsoleto divisam integro, fauce 

 lamellam sicut maxillam pone labrum gerente ; lamella columellari 

 recta, superne bifm-cata. 



Diam. -\ poll. Hab. Tennessee. 



This shell, which is smaller and somewhat more globose than H. 

 hirsuta, is well characterized by its partially bifurcated pillar tooth, 

 and by the peculiar jaw-like plate, almost concealed behind the in- 

 flexed lip, within the fauces. 



Helix letorina. T. parva, lenticulari, lucida, rufo-cornea, 

 pilosiuscula, leviter striata, vix perforata ; spira depressa, anfr. 5 

 convexiusculis, ultimo superne' subangulato ; regione umbilicali exca- 

 vato ; aperturS, lunata, labro incumbente, reflexo, roseo, dentes duos 

 albos sinum amplectentes gerente ; lamella columellari obliquii, alba, 

 erecta, acuta, rectangulari, callo lineari superne ad angulum aper- 

 tura? juncta. 



