140 HELICID^E. 



2O. HELIX APPRESSA, SAY. 

 PLATE XIII. 



H. testa depressa, imperforata, luteo-cornea ; anfractibus 

 oblique striatis ; apertura angusta ; labro albo, sub-dentato, 

 margins reflexo ; collumella dente unico arcuato armata. 



SYNONYMS AND EEFEEENCES. 



Helix appressa, SAY, Journ. Acad. II. 154, anno 1821. 



KIRTLAND, Ohio Report, 172. 



BINNEY, Boston Journ. III. 356, pi. 8. 



DE KAY, New York Report, 31. 



CHEMNITZ Conch. 2d. ed. t. 63, f. 17, 18. 



PFEIFFEE, Monog. Helic. Viv. I. 317. 

 Helix liiiguifera, LAMARCK, VI. 90, anno 1822. 



FERUSSAC, Prodr. 95 ; Hist. pi. 49, a. f. 3. 



DESHAYES in LAMARCK, VIII. 70. 



Encyc. Meth. II. 224. 

 Tridopsis appressa, BECK, Index, 22. 



DESCRIPTION. 



ANIMAL. Uniform blackish slate color, and resem- 

 bling in all respects the animal of Helix palliata. 



SHELL depressed ; epidermis yellowish horn-color ; 

 whorls five, often somewhat angulated, with fine, dis- 

 tinct, transverse strise ; aperture rather flattened, con- 

 tracted ; lip white, reflected, near the base appressed to 

 the body-whorl and covering the umbilicus, with one, or 

 two, or even no projecting teeth on its inner edge ; 

 pillar-lip with an oblique, compressed, white tooth ; base 

 convex ; umbilical region slightly indented. 



Greatest transverse diameter, less than three-fourths 

 of an inch. 



