350 Remarks on Certain Species of 



The measurements of a rather large example are, — 



Diam. maj. 6, min. 5, alt. 2£ mill. 



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

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

 Arkansas, for which I am indebted to Mr. H. Yan 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 352. 

 SYNONYMY. 



Helix pustula Binney Terr. Moll. II. p. 201, pi. xxxix. fig. 3. 1851. 



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

 pallide-cornea, minute striatula, ; epiclermide tenui, pilosiuscula ; spira 

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

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

 subito deflexo, basi deviante ; sutura valde impressa ; umbilico lato, £ 

 diam. maj. sequante, omnes anfractus monstrante, pra3sertim penultimum ; 

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

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

 angulum apertura; juncto; perist. reflexo, roseo, marginibus conniventibus, 

 dentibus duobus sinu disjunctis instructo. 



Shell widely umbilicate, planorboid, thin, rufous or pale 

 horn-colored, delicately striated, with thin sparingly hirsute 

 epidermis; spire scarcely elevated; whorls 4-4-£, slightly con- 

 vex, gradually increasing, the last subangular at the periphery, 

 at the aperture gibbous, constricted, suddenly deflexed, beneath 

 devious ; suture rather deeply impressed ; umbilicus wide, 

 equal to one-third of the larger diam. of the shell, showing all, 



