HELIX. 



175 



small Planorbis, rather than a Helix. It is closely 

 allied to H. rupestris of Europe, but is somewhat larger. 

 It bears a closer resemblance to H. lineata than to any 

 other North American species. Its circular, campanu- 

 late aperture, almost disconnected with the preceding 

 whorl, is one of its most striking peculiarities. [G.] 



36. HELIX PUL.CHELLA, MULLER; 

 PLATE XVII. FIGURE 1. 



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

 anfractibus quatuor ; apertura circular! ; labro crasso, albo, 

 margine reflexo. 



SYNONYMS AND EEFERENCES. 



Helix pulchella, MULLER, loc. cit. 30, No. 232. 



BINNEY, Best Journ. Nat. Hist. III. 375, pi. 9, f. 2. 

 GOULD, Invertebrata, 176, f. 102. 

 ADAMS, Vermont Mollusca, 9. 



Silliman's Journ. XLI. 272. 



Helix minuta, SAY, Nicholson's Encyc. ; Journ. Acad. I. 123. 

 KIRTLAND, Ohio Report, 173. 

 DE KAY, New York Report, 31. 



Nat. Hist. New York, p. 40, pi. 3, f. 33, a. b. 



DESCRIPTION. 



ANIMAL whitish, semi-transparent. 



SHELL depressed, slightly convex above, thin, and 

 transparent ; epidermis colorless ; whorls four, very 

 minutely striated, the last large, and spreading at the 

 mouth like a trumpet ; aperture orbicular, a little 

 dilated; lip much thickened, white, reflected, making 



