204 HELICID^. 



Section II. Lip simple. 



e. Aperture destitute of teeth or folds within. 

 48. HELIX LIGERA. 



Plate XXXV. 



H. testa sub-globosa, perforata, nitida, cornea ; anfracti- 

 bus septem, oblique striatis ; apertura lunato-rotundata ; 

 labro simplici, acuto ; basi prope aperturam albo, interne 

 incrassato. 



SYNONYMS AND REFERENCES. 



Hdix ligera, Say, Journ. Acail. II. 157, anno 1821. 

 Exped. St. Peter's Riv. II. 258. 



KiKTi-AND, Ohio Report, 173. 



S.iGEE, Micliifan CHtalogue, 14. 



BiNNEY, Boston Journ. Nut. Hist. III. 412, pi. 20, f. 1. 



De Kay, New York Report, 31. 



Chemnitz, Sd. ed. pi. 33, f. 5-7. 



Pfeiffer, Monog. Helic. Viv. I. 48. 

 Helix Rajinesquea, Ferussac, Tab. Syst. 50. 



Hist. pi. 51, a. 5, pi. 50, a. f. 4, 5 ? 

 Ildix Wardiana, Lea, Am. Pliil. Trans. VI. 67, p. 23, f. 82. 



DESCRIPTION. 



Animal uniform blackish slate-color over the -whole 

 upper surface, paler on the posterior extremity and base ; 

 collar grayish-white ; foot narrow, exceeding in length 

 twice the tranverse diameter of the shell. 



Shell sub-globose ; epidermis yellowish horn-color, 

 shining ; whorls seven, finely and thickly striated trans- 

 versely ; suture not much impressed ; aperture semilu- 

 nate, rounded ; lip thin, acute ; base and side of the 

 outer whorl, within the aperture, thickened and white ; 



