66 BKIT1SH MOLLUSKS. 



5. Helix Cantiana. Kentish Helix. 



Shell; rather narrowly umbilicated, globosely depressed, subdis- 

 coid, thin, semitransparent, rufous, dull, livid 

 white towards the apex, spire but little raised, 

 suture rather impressed, whorls five and a half 

 to six, rounded, densely rudely arcuately pli- 

 cately striated; aperture lunar- circular, lip 

 sharp, a little expanded, edged within, columel- 

 lar margin shortly dilately reflected, but not 

 covering the umbilicus. 



Helix Cartliusiana, Draparnaud (1801), Tabl. Moll.]). 86 

 (not of Miiller). 



Helix Cantiana, Montagu (1803), Test. Brit. p. 422 and Supp. p. 145. 

 pi. xxiii. f. 1. 



Helix pallida, Donovan (1803), Brit. Shells, vol. v. pi. clvii. f. 2. 



Theba Carthusiana, Kisso (1826), Hist. Nat. Europ. Merid. vol. iv. p. 74. 



Tela Cantiana, Leach (1831), Turt. Man. p. 94. 



Fruticicola Carthusiana, Held (1837), Isis, p. 914. 



Bradybcena Cantiana and Brunonensis, Beck (1837), Ind. Moll. p. 19. 



Helix Carthusianella, pars, Morelet (1845), Desc. Moll, du Port. p. 62. 



Helix Galloprovincialis, Dupuy (1848), vol. ii. p. 204. pi. xvi. f. 9 to 12. 



Helix (ZenobiaJ Cantiana, Moquin-Tandon (1855), Hist. Moll. vol. ii. 

 p. 201. pi. xvh. f. 9 to 13. 



Hab. Central and South France. Italy. Portugal. Chiefly south-eastern 

 counties of England. (Among hedges, mostly in chalk districts.) 



This and the following species should be studied together. They 

 have a certain general resemblance, and are frequently confounded 

 by authors, but they are in reality very distinct. H. Cantiana, 

 which Draparnaud originally took for Muller's H. Carthusiana, and, 

 to mend the matter, named the true species H. Carthusianella, is 

 much the larger shell, and of more irregular rudely striated growth. 

 The strise where they emerge from the sutures are even clumsily 

 puckered ; and colour comes to our aid in characterizing this species. 

 The lower half of the shell is always tinged with a rufous foxy rust 

 colour, while towards the apex the shell is whitish and rather opake. 

 In H. Carthusiana, as we shall presently see, the shell is smaller, 

 and, though more transparent, it is yet firmer, and more finely and 

 regularly striated. The aperture, as in H. Cantiana, has an inter- 

 nal rib, but it is more developed and more conspicuously milk-white, 

 edged with red. 



