930 HELIX. 



MAMMlLLARis. 99. Shell umbilicated, ovate, with 

 three striated whirls, and the body-whirl very 

 large ; aperture ovate, and large. 



Helix mammillaris. Linnceus Si/st. Nat. p. 1246. Born 



Mus. p. 380. t. 15. f. 13 and 14. Gmelin, p. 3636. 

 NerJta adusta. Chemnitz, v. p. 278. t. 189. f- 1926 and 



1927. Museum Leskianum, p. 290. 

 Nerita melanostoma. Gmelin, p. 3674. 

 Nerita, No. 21. Schroeter Einl. ii. p. 311. 

 Le Teton de Negresse. Favanne, ii. p. 290. t. 11. f. H 3. 

 Lister Conch, t. 566. f. 15. Seba, iii. t. 41. f. 20. 



Inhabits rivers in Guinea. Linnceus. Philippines, Isle of France, 

 St. Domingo, and Martinique. Favanne. 



Shell about an inch and a half long, and thirteen lines broad, 

 of a whitish colour, with three broad obsolete purplish brown 

 bands, which are visible in the throat, and the inner lip is 

 brown ; the body-whirl comparatively with the spire is very 

 large, and is marked with fine transverse crowded striae, and 

 more remote longitudinal ones ; the aperture is large, and has 

 the pillar-lip reflected over the umbilicus. The present shell 

 would stand better with the Nerites, but I do not think there 

 can be any doubt that it is the Linnoean H. mammillaris. 



HISPANA. 100. Shell convex, with five rounded 

 whirls, and the aperture sub-orbicular ; um- 

 bilicus narrow, and perforated. 



Helix Hispana. Linnceus Si/st. Nat. p. 1246. Gmelin, p. 

 3637. 



Inhabits the South of Europe. Linnceus. 



To the above description Linnaeus, without any reference, has 

 only added that the shell is of a horn-colour; and this must 

 therefore most probably always remain a very uncertain spe- 

 cies. 



LUTARIA. 101. Shell umbilicated, ovate-oblong, 

 more strongly coloured internally, and the 

 aperture sub-ovate. 



Helix lutaria. Linnceus Si/st. Nat. p. 1246. Gmelin, p. 

 3637. 



Inhabits 



This is another doubtful species, which no subsequent author 



has noticed ; and Linnaeus, in the Mus. Lud, Ulr., describes 



