40 Remarks on Certain Species of 



whorls are less convex, the incremental strise less numerous and 

 distinct, and the apertm-e is wider. The umbilicus is more 

 nearly covered by the lip, and is without the groove which 

 prevails in Ferussac's species. 



"Within and near the aperture, there is what may be called 

 the "y«?crw77i," extending from the floor of the last to that of 

 the penultimate whorl, and approaching in character to, but less 

 strongly developed, than that in S. monodon. Rack. The outer 

 edge of \\\\s, fulcnmi is uneven, — ^in one of my specimens some- 

 what denticulated. 



The measurements of a rather large example are, — 



Diam. maj. 6, min, 5, alt. 2f mill. 



In my cabinet is a specimen from Green Co., Indiana, re- 

 ceived from Dr. T. E.. Ingalls, one from the vicinity of Helena, 

 Arkansas, for which I am indebted to Mr. H. Van Nostrand, 

 — and one given to me by Mr. W. G. Binney, as to the habitat 

 of which I am uncertain. Mr. Binney has a specimen collected 

 in Illinois. 



Helix pustuloides Bland. 



Fig. 2. Page 42. 

 SYNONYMY. 



'E.^Wx pustula Binney Terr. Moll, 11. p. 201, pi. xxxix, fig. 3. 1851. 



T. late et perspective urabilicata, planorboidea, tenuiuscula, rufo- vel 

 pallide-cornea, minute striatula ; epidermide tenui, pilosiuscula ; spirS, 

 vix elevata; anfr. 4-4^, convexiusculis, lente accrescentibus, ultimo su- 

 perne ad peripheriam obtuse angulato, ad aperturam gibboso-constricto, 

 subito deflexo, baai deviante ; sutura valde impressa ; umbilico lato, -^ 

 diam. maj. aequante, omncs anfractus monstrante, prsesertim penultimum ; 

 apertura obliqua, lunato-circulari ; dente erecto, obliquo, albo, lamelli- 

 formi, in pariete aperturali munito, callo lineari subarcuato superne ad 



