HELIX. 53 



Testa supra plano-convexa, subtus convexa, lutea, oblique striata, um- 

 bilicata ; spirS brevi ; suturis subinipressis ; anfr. 5, subconvexis ; aper- 

 tura lunata ; labro intus incrassato. Diam. .45. Length .32 inch. 



HELIX CLARKII Lea. 

 Plate LXXVIL Figure 10. 



T. superne rotundata, inferne plano-convexa, regulariter striata brun- 

 neo-cornea, imperforata, unidentata : anfr. 7, oblique striatis ; apertura 

 lunata, subdilata ; labro albido, reflexo, inferne calloso ; columella in 

 medio unidentata, ad basim impressa. (Lea). 



SYNONYMS AND REFERENCES. 



Helix Clarkii Lea, Pioc. Acad. Nat. So. Phila. x. p. 41, March, (1858). 

 DESCRIPTION. 



Animal not observed. 



Shell imperforate, globosely-rounded, regularly and 

 finely striated, reddish horn color ; spire obtusely conic ; 

 whorls 7, convex, with delicate incremental strise, the last 

 one very globose and rounded below ; aperture lunate ; 

 peristome white, thickened, reflected, its basal termination 

 quite heavy and covering the umbilicus entirely ; one 

 elongated, white denticle on the parietal wall of the 

 aperture. 



Greater diameter 14 ; lesser 13 ; height 9 millimetres. 



Geographical Distribution. Cherokee County, N. C. 



Remarks. This is a distinct species. At first sight it 

 seems a miniature elevata, but is at once distinguished 

 by its peculiar globular shape. 



The figure referred to is twice the natural size of the 

 shell. 



HELIX THYROIDES Say vol. ii. p. 129, pL xi. 



Helix ihyroidus Say, (Binney's ed.) p. 3.3, pi. xiii. 



Chenu, Bibl. Conch. 3, 24, pi. iii. fig. 3. 



DeKay, 1. c. p. 29, pi. ii. fig. 8. 



Mrs. Gray, Fig. Moll. An. pi. 291, f. 6. {Ex. Host. Journ. absq. 



desc. ) 

 Desha yes in Lam. 3d ed. 3, 309; in Fer. i. 209. 



