HELIX. 189 



smaller tlian any specimen of H. avara that I have seen, 

 and have other specimens of R. avara, so called, as large 

 as the most mature R. auriculata. Plate XL. figure 1, 

 represents the mature shell ; figure 2, the young shell, 

 described by Say as P. avara. 





41. HELIX VULTUOSA, Gould. 



Plate XL. a. Figure 4. 



H. testa orbiculari, utrinque convexiuscula, rufo-cornea, 

 late umbilicata, confertim striata : spira depressa, anfract- 

 ibus 5J- conve.xis, ultimo ad peripheriam subangulato: 

 apertura lunari ; labro albo, crasso, tortuoso, dente basali, 

 marginali, falcato, et dente mediano, obliquo, profundo, 

 armato ; lamella columellari obliqua, arcuata, erecta, nisi 

 infra ad labrum juncta. 



SYNONYMS AND EEFEKENCES. 



Helix imltuosa, Gould, Proc. Best. Soc. Nat. Hist. III. 39, anno 1848. 

 DESCRIPTION. 



Shell orbicular, depressed, about equally convex on 

 both sides, rather solid, dark horn-color, delicately stri- 

 ated ; spire a low dome, composed of about five and a 

 half -whorls, which are moderately convex, and separated 

 VOL. u. 48 



