180 HELICID^. 



38. HELIX SAYI, BINMET. 

 Plate XXIII. 



H. testa orbiculato-depressa, tenui, luteo-cornea, profunde 

 umbilicata ; anfractibus tenuiter striatis, striis confertis, obli- 

 quis ; apertura rotundata ; labro albo, margine anguste re- 

 flexo, ad basim unidentato ; columella dente unico albo, 

 «xiguo, armata. 



SYNONYMS AND KEFERENCES. 



Hdix diodonta, Say, Exped. St. Peter's, II. 257, pi. 15, f. 4. 

 KiRTLAND, Ohio Report, 173. 

 De Kay, New York Report, 31. 

 Deshayes ia Contin. Ferussae, pi. 69, i. f. 2, an. 1820. 

 Helix Sayi, Binney, Bost. Journ. Nat. Hist. HI. 379, pi. 16. 

 Adams, Vermont Mollusca, 10. 

 Pfeiffer, Monog. Helic. Viv. I. 382. 



DESCRIPTION. 



Animal light reddish-brown, tentacles smoky, eyes 

 black; head and neck cylindrical, foot narrow, terminat- 

 ing in an acute point ; length about twice the diameter 

 of the shell. 



Shell depressed, convex, thin ; epidermis hght rus- 

 set, shining ; whorls between five and six, with numerous 

 fine, oblique striae ; suture impressed ; aperture rounded, 

 not dilated ; lip white, narrow, reflected, mth a slightly 

 projecting tooth on the inner edge near the umbilicus ; 

 columella with a sub-prominent, white tooth ; umbilicus 

 open, deep, not wide, exhibiting all the volutions, slightly 

 contracted by the reflected lip ; base rounded, with the 

 striiB distinct, convergmg into the umbilicus. 



