HELIX. 161 



The spire rises in a subcorneal form to the apex, each 

 whorl gradually and regularly diminishing, from the 

 body-whorl upwards. The whorls are convex, the striae 

 of growth regular and fine and very delicate. Crowded, 

 impressed lines revolve upon the whorls. The lip is dis- 

 tinctly reflected at the base W the shell ; but the reflec- 

 tion diminishes towards its upper part, and becomes 

 entirely obsolete before it joins the body-whorl. The 

 umbihcus is of inconsiderable diameter, but deep, and is 

 somewhat encroached upon by the reflection of the lip. 



The description of the animal has been drawn from 

 Mr. Drayton's figure in the Mollusca of the Exploring 

 Expedition. 



Dr. PfeiSer regards this as the H. fidelis, Gray, 

 (Proc. Zool. Soc. July, 18-34, p. 67.) and has so cata- 

 logued it in his Monography, I. 338. If it is really so, 

 Mr. Gray's description anticipates that of Mr. Lea 

 about five months. 



29. HELIX TOWNSENDIANA, LEA. 



Plate XIX. 



H. testa orbiculato-convexa, luteo-rufescente, rugosa, 

 umbilicata ; apertura sub-rotundata ; labro albo, reflexo, 

 ad basim interne incrassato ; columella Isevi ; basi tumido. 



• SYNONYMS AND BEFEEENCES. 



Helix Ihunuendiana, Lea, Am. Phil. Trans. VI. 99, pi. 23, f. 80. 



BiNNEY, Boston Jour. Nat. Hist. III. 371, pi. 13. 

 De Kay, Nat. Hist. New York, p. 46. 

 Pfeiffer, Monog. Helic. Viv. I. 341. 



VOL. II. 41 



