40 NEW- YORK FAUNA — MOLLUSCA. 



Helix ligera. 



PLATE m. FIG. 32. A. B. — (STATE COLLECTION.) 

 Helix ligera? Say, Jour. Acad. Nat. Sci. Vol. 2, p. 157. 



Description. Shell subglobose, polished ; the body-whorl pellucid. Spire somewhat ele- 

 vated. Volutions five to six, with minute transverse wrinkles ; the apex smooth. Umbilicus 

 moderately large. Lip simple, not reflected, but slightly everted at its lower margin so as 

 partially to cover the umbilicus. Suture distinct. Aperture lunate, broader than high. 



Color. Light yellowish ; darker on and within the aperture. 



Diameter, • 5 - • 6. Height, 0-3-0-4. 



This species, which I noticed in Ontario county, varies very much in size, the smallest 

 not exceeding two-tenths of an inch in diameter. The everted lip, and the large umbilicus, 

 would seem to indicate a distinct species from that to which I have referred it. It may, 

 however, remain provisionally here. It was found in low meadows. 



Helix minuta. 



PLATE III. FIG. 33. a. b. — (STATE COLLECTION.) 



Helix minuta. Say, Nich. Ency. No. 7. Acad. Nat. Sc. Vol. 1, p. 123. 



H. pulchella. Binney, Bost. Jour. Nat. Hist. Vol. 3, pi. 13. 



H. id. Gould, Invertebrata of Mass. p. 176, fig. 102 (excl. syn.). 



H. id. Adams, Am. Jour. Science, Vol. 41, p. 272. 



Description. Shell very minute, polished, depressed. Whorls three or four, with faint 

 transverse wrinkles. Suture deeply impressed. Umbilicus large, exhibiting all the volutions. 

 Aperture nearly orbicular. Lip thickened and reflected, not approaching beneath the umbi- 

 licus. 



Color. Whitish or light horn-color, or opake white. Animal pale-colored. 



Diameter, • 08 - • 1 . Height, 0-05. 



Under the bark of trees, and among rotten wood ; extending from Massachusetts to Mis- 

 souri. It is thought by some of our eminent conchologists to be identical with the European 

 pulchella of Miiller, notwithstanding the sharp parallel ribs which characterize that species. 

 As I view it, I shall consider it as exclusively an American species. The specimen which 

 furnished the figure was obtained from Crownpoint, Essex county. 



