240 HELICID^E. 



margined. Aperture narrow, semilunar ; lip simple, not 

 thickened by callus within. Base perforated by a deep, 

 rather small, funnel-shaped umbilicus. 



Diameter one-fifth of an inch ; axis one-tenth of an 

 inch. 



GEOGRAPHICAL DISTRIBUTION. Found by Mr. Bart- 



lett, in Tennessee. 



REMARKS. This delicate species has the size and 

 color of H. indentata, and is similarly striated above. 

 The whorls are numerous and closely convoluted, as in 

 H. suppressa, which it most nearly resembles ; but it has 

 a larger umbilicus, like H. lasmodon, and has no thick- 

 ening, or plate, within the aperture. The name first 

 applied to this species being preoccupied, another has 

 been substituted. [G.] 



69. HELIX SELENINA, GOULD. 

 PLATE XXIX. a. FIGURE 2. 



H. testa parva, depressa, albida, tenuissima, minutissime 

 striata, diaphana ; anfractibus quinque, convexis, ultimo 

 sub-angulato ; suturis impressis ; basi convexo ; axi aperto, 

 umbilico infundibuliformi ; apertura depresso-transversa ; 

 labro simplici, acuto. 



SYNONYMS AND REFERENCES. 



Helix - - BINNEY, Proc. Bost. Soc. Nat. Hist. II. 25. 



Helix sdenina, GOULD, Proc. Bost. Soc. Nut. Hist. III. 38, June, 1848. 



DESCRIPTION. 



SHELL small, depressed, pale bluish-white, pearly, 



