250 HELICID^E. 



74. HELIX GULARIS, SAY. 

 PLATE XXXVII. FIGURES 3, 4. 



H. testa elevato-convexa, nitida, imperforata, luteo-cor- 

 nea ; anfractibusseptem,striatis ; labrosimplici, acuto, intus 

 incrassato ; apertura transversali, dentibus duobus lamellatis 

 interne armata ; basi piano. 



SYNONYMS AND REFERENCES. 



Helix gularis, SAY, Journ. Acad. II. 156. 



KIRTLAND, Ohio Report, 173. 



BINNEY, Boston Journ Nat. Hist. III. 408, pi. 11, f. 1. 



DE KAY, Nat. Hist. New York, 46. 



FERUSSAC, Hist. pi. 51, a. f. 4. (?) 



CHEMNITZ, 2d ed. tab. 101, f. 5-8. 



PFEIFFER, Monog. Helic. Viv. I. 183. 



DESCRIPTION. 



ANIMAL bluish-black on the head and back, the 

 other parts dingy white ; tentacles long, slender, en- 

 larged, but not much bulbous at tip ; foot above, dirty 

 greenish. 



SHELL sub-conical ; epidermis shining, pale yellowish 

 horn-color ; spire sometimes tending to a point, at other 

 times obtuse ; whorls seven or eight, very minute at the 

 apex, increasing in diameter regularly and gradually, un- 

 til they reach the aperture, with strongly marked, curved 

 striae ; suture impressed and distinct ; aperture trans- 

 verse, not much expanded ; lip simple, thin at its edge, 

 within thickened with a white, testaceous deposit ; base 

 flat, indented in the centre, near the aperture yellowish- 

 white and opaque ; umbilicus small and rounded in young 



