204 HELICID^E. 



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. 



Helix ligera, SAY, Journ. Acad. II. 157, anno 1821. 

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



KIRTLAND, Ohio Report, 173. 



SAGER, Michigan Catalogue, 14. 



BINNEY, Boston Journ. Nat. Hist. III. 412, pi. 20, f. 1. 



DE KAY, New York Report, 31. 



CHEMNITZ, 2d. 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 ? 

 Helix Wardiana, LEA, Am. Phil. 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 tho aperture, thickened and white ; 



