80 BRITISH MOLLUSKS. 



of all the other species of the genus, in which the theoretical law 

 of migration points to a north-westerly course P 



18. Helix fulva. Fulvous Helix. 



Shell ; minutely umbilicated, globosely trochiform, very thin, glossy, 



fulvous, spire obtusely conoid, whorls six, convex, 



narrow, last whorl flatly convex at the base, very 



finely striated ; aperture depressed, narrowly lunar, 



lip simple, thinly dilated over the umbilicus. 

 Helix fulva, Miiller (1774), Verm. Hist, part 2. p. 56. 

 Trochus terrestris, Da Costa (1778), Test. Brit. p. 36 (not of 



Chemnitz). 

 Helix trochiformis, Montagu (1803), Test. Brit. p. 427, pi. xi. 



f. 9. 

 Helix nitidula, Alten (1812), Syst. Abhandl. p. 53. pi. liv. f. 8 



(not of Draparnaud). 

 Helix irochulus, Dillwyn (1817), Desc. Bee. Shells, vol. ii. p. 916 (not of 



Hartmann). 

 Theba fulva, Leach (1831), Turton, Man. p. 99. 

 Helix Mortoni, Jeffreys (1833), Trans. Linn. Soc. vol. xvi. p. 332. 

 Conulus fulvus, Fitzinger (1833), Syst. Verz. p. 94. 

 Polita fulva, Held (1837), Isis, p. 916. 

 Petasia trochiformis, Beck (1837), Ind. Moll. p. 21. 

 Zonites (Conulus ) fulvus, Moquin-Tanclon (1855), Hist. Moll. vol. ii. p. 67. 



pi. vhi. f. 1 to 4. 

 Hab. Throughout Etirope. Siberia. Azores. (Under stones, decaying 



leaves and moss, in damp and shady places.) 



Authors are somewhat divided in opinion, as to whether this little 

 species should be referred to Helix or Zonites. It has a decidedly 

 heliciform shell, composed of six narrow whorls convoluted into a 

 globose trochus-shape, so closely as only to leave the smallest possible 

 umbilicus ; while the animal is described as closely resembling that 

 of Zonites nitidus. It is found in all parts of Britain, and is very 

 generally distributed throughout Europe, passing to Siberia in the 

 north and to the Azores in the south. 



H. fulva is represented by a very similar and equally widely spread 

 species in the United States, H. cJwrsina, Say, which some writers 

 incline to think is the same. 



