39 



H. hirsuta^ is well characterized by its partially bifurcated pillar 

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

 the inflexed lip, within the fauces. 



Helix leporina. Testa parva, lenticulari, lucida, rufo-cornea, 

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

 convexiusculis, ultimo superne subangulato ; regione umbilicali 

 excavato ; apertura lunata, labro incumbente, reflexo, roseo, 

 dentes duos albos sinum amplectentes gerente ; lamella columel- 

 lari obliqua, alba, erecta, acuta, rectangulari, callo lineari superne 

 ad angulum aperturse juncta. Diam. ^-, alt. |- poll. Hab. Mis- 

 sissippi and Arkansas. 



Intermediate between H. hirsuta and H. inflecta, though small- 

 er than either. It is less globose than hirsuta, while the aperture 

 is much the same, except that the sinus of the lip is formed 

 by the projection of two teeth instead of by an emargination, 

 in this respect resembling H. injiecta. From the latter it differs 

 in the columellar tooth. It resembles II. piistula still more, but 

 the umbilical region wants the peculiar channel of that species. 



Helix vultuosa. Testa depressa, utrinque convexiuscula, 

 tridentata, rufo-cornea, late umbilicata, H.fallaci et H. texasi- 

 ana intermedia ; anfr. 5^ arete volutatis, convexis, ultimo ad 

 peripheriam sub-angulato ; apertura arete lunari, labro albo, 

 crasso, tortuoso, dentibus duobus instructo, quorum altero medi- 

 ano profunde posito, retrocedente, altero basali, marginali, 

 falcato ; lamella columellari obliqua, arcuata, erecta, faucem 

 fere occludente. Diam. |, alt. } poll. Hah. Arkansas and 

 Texas. 



Differs from H./allax in being generally smaller and more 

 convex, with a narrower aperture more nearly closed by the 

 teeth, and in having the basal tooth much more developed and 

 the median one deeper seated and directed more inward ; from 

 H. texnsiana it is distinguished by having an open umbilicus, 

 and by having no line of callus connecting the pillar tooth with 

 the upper angle of the aperture, forming a re-entering angle. 



Many other Shells are contained in the Collection, which are 

 either new species, or very strongly marked varieties of the 

 northern types. Among them is one, which seems to be quite 



