1 30 GENUS XXIX. HELIX,. 



liollowed laterally by the convex projection of the last 

 whorl but one (see Helix Cornu arietis, pi. 8. /. 105). 



Helix. Shell globular or orbicular, with a convex or conic 

 spire ; aperture entire, wider than long, hd'owed at the 

 \ipper part by the convex projectioB of the last turn but 

 one (see Helix Pomatia, pi. 8. /. liO). 



SroARET. Shell depressed, somewhat ear-shaped ; spire short, 



and little elevated ; the apertme entire, spread out very 



wide, longer than wide (see Helix haliotoidea, pi. 8. 



/.111). 



The last Lamarck places with the Naked MoUusca, the shell 



being inclosed in the skin, like Bulla aperta. 



Perhaps here we may place Lamarck's genera of Helicina 



and Testacella, as follow: 



Helicina. Shell somewhat globular, no vimbilicus; the aper- 

 ture entire, semi-oval ; the pillar thickened, compressed 

 at the base (see List. Conch, t. 61. f. .59). 



Testacellj. Shell miivalve, obliquely conic, the summit a 

 little spiral ; aperture oval, the left iip rolled inwards (see 

 Favanne, 70). 



