204 



Diam. ^ ; alt. -| poll. Hab. Mississippi and Arkansas. 



Intermediate between H. Mrsuta and H. inflecta, though smaller 

 than either. It is less globose than Mrsuta, while the aperture is 

 much the same, except that the sinus of the lip is formed by the pro- 

 jection of two teeth instead of by an emargination, in this respect 

 resembling H. inflecta. From the latter it differs in the columellar 

 tooth. It resembles H. pustula still more, but the umbilical region 

 wants the peculiar channel of that species. 



Helix vultuosa. T. depressa, utrinque convexiuscula, triden- 

 tata, rufo-cornea, late umbilicata, H. fallaci et H. texasiana inter- 

 media ; anfr. 5.J arete volutatis, convexis, ultimo ad peripheriam sub- 

 angulato ; apertura arete lunari, labro albo, crasso, tortuoso, dentibus 

 duobus instructo, quorum altero mediano profunda posito, retroce- 

 dente, altero basali, marginali, falcato ; lamella columellari obliqua, 

 arcuatfi, erecta, faucem fere occludente. 



Diam. f ; alt. \ poll. Hab. Arkansas and Texas. 



Differs from H.fallax 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. texasiana it is dis- 

 tinguished by having an open umbilicus, and by having no line of 

 callus connecting the pillar tooth with the upper angle of the aper- 

 ture, forming a re-entering angle. 



Many other Shells are contained in this Collection, which are either 

 new species, or very strongly marked varieties of northern types. 

 Among them is one, which seems to be quite common from Georgia 

 to Texas, and which Dr. Binney regarded as the southern form of 

 H. thyroidus, though some of his specimens were labelled " clausa ? " 

 They have the globular form of H. clausa, sometimes approaching 

 even to II. elevata in height ; the aperture is large and rounded, the 

 umbilicus generally quite closed, and the columella sometimes pos- 

 sesses and as often is destitute of a tooth like H. thyroidus. I think 

 further observation will establish its claim as a distinct species, and 

 in such case I would propose for it the name of H. btjcculenta. 



Another form, found in the southwestern States, is allied to //. 

 appressa and H. palliata. It is a little more globular than the former, 

 has its peculiar imperforate base, but its aperture is more open and 

 rounded, and destitute of a tooth. H. Columbiana is still more globu- 

 lar, smoother, with an open umbilicus and a peculiar sinuosity of the 

 lip. I would indicate this form by the name of H. abjecta 

 [divesta]. 



Pupa variolosa. T. minima, ovato-conica, rufa, sub-perforata, 

 confertim indentata ; anfr. | turgidis ; sutura profunda ; apertura ob- 



