258 HELICID^. 



be a doubt that Helix parvula, Desbayes, is identical 

 with this shell ; as his description will not apply to any 

 other than this species and H. striatella, and the angu- 

 lated character of the stri?e svifficiently point to this. 



There is a Helix described under the same specific 

 name by Wagner, in Spix's Testacea of Brazil ; but as 

 that did not appear until ten years after Mr. Say's publi- 

 cation, a new name must be adopted for the Brazilian 

 species. 



78. HELIX MULiTIDENTATA, BiNNEY. 



Plate LXVIII. 



H. testa minima, orbiculuto-depressa, umbilicata, tenuis- 

 sima, pellucida, nitida, supra planulata ; anfractibus sex, 

 oblique et minute striatis ; apertura semilunata, angusta ; 

 labro simplici, acuto ; umbilico parvo. 



SYNONYMS AND EEFERENCES. 



Ilelijc muhideiUata, Binney, Boston Joiirn. Nat. Hist. IH. 425. pi. 22, f. 5. 

 Adams, Vermont Mollusca. 

 Chemnitz, 2d ed. tab. 101, f. 9-12. 

 Pfeiffeb, Monog. Helic. Viv. I. 1S4. 



DESCRIPTION. 



Animal rosy-white, thread-like. 



Shell depressed, sub-planulate above, very thin, pel- 

 lucid ; epidermis smooth, shining ; whorls six, narrow, 

 shghtly convex, increasing but slowly in diameter, lines 

 of growth hardly visible ; suture impressed ; aperture 

 semi-lunate, narrow ; lip acute ; umbilicus very small, 



