HELIX. 175 



small Planorbis, ratlier than a Helix. It is closely 

 allied to H. rvpestris 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 pecuharities. — [g.] 



36. HELIX PULCHELLA, MtJLLER. 

 Plate XVII. Figure 1. 



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

 anfractibus quatuor ; apertura circulari ; labro crasso, albo, 

 margine reflexo. 



SyNONYMS AND KEFEKENCES. 



Helix pulchella, MOixek, Ioc. cit. 30, No. 232. 



BiNNEY, Bost. Journ. Nat. Hist. III. 375, pi. 9, f. 2. 

 Gould, Invertebrata, 176, f. 102. 

 Adams, Vermont Mollusca, 9. 



Silliman's Joura. XLI. 272. 

 Helix minuta, Sat, Nicholson's Eiicyc. ; Joura. Acatl. I. 123. 

 Kietland, Oliio 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 



