HELIX. 221 



57. HELIX MINUSCULA, BINNEY. 

 PLATE XVII. a. FIGURE 2. 



H. testa minuta, orbiculato-depressa, umbilicata, albida ; 

 anfractibus quatuor, convexis ; apertura circular! ; labro 

 simplici, acuto. 



SYNONYMS AND INFERENCES. 



Helix mitmscula, BINNEY, Boston Journ. Niit. Hist. IIL 435, pi. 22. f. 4. 



ADAMS, Vermont Mollusca, 11. 



CHEMNITZ, 2d ed. tab. 85, f. 20-23. 



PFEIFFER, Symbol. II.; Monoj,*. I. 114. 

 Helix minutissima, LEA. Proceed. Am. Phil. Soc. No 19. 



DESCRIPTION. 



ANIMAL not observed. 



SHELL. Minute, depressed-convex ; epidermis whit- 

 ish ; whorls four, convex, not increasing rapidly in diam- 

 eter ; suture very distinctly impressed ; aperture nearly 

 circular ; lip thin, acute ; umbilicus large, not spread, 

 deep, and exhibiting the volutions ; base rounded, colum- 

 ella with a thin callus. 



Greatest transverse diameter less than one-eighth of 

 an inch. 



GEOGRAPHICAL DISTBIBUTION. Found in Ohio, on 

 the margins of streams, under chips or sticks in damp, 

 shaded situations, or under the bark of decaying stumps 

 near the surface of the waters, very common in the city 

 of Cincinnati, among grass in gardens. It is also found 

 rather abundantly in some parts of Vermont. Mr. Bart- 

 lett found it in Mississippi, Arkansas, and Florida. 



