68 



BRITISH MOLLUSKS. 



Bradylalia Carthusiana, Beck (1837), hid. Moll. p. 19. 

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



Hah. Central and Southern Europe. South-eastern counties of England 

 (on the chalk downs). 



The true H. Carthusiana, as we have it in the south-eastern 

 counties of England upon the chalk downs, is a smaller and more 

 symmetrically developed shell than H. Cantiana. On the Conti- 

 nent the two forms come nearer to each other r and they have been 

 frequently recorded as varieties of the same species under Drapar- 

 naud's inadmissible name of Carthusianella. The shell is of a firm 

 growth characterized by a livid transparency, minutely striated 

 throughout, and there is a conspicuous milk-white rib within the 

 aperture, between which and the lip the shell is coloured red. 



H. Carthusiana is less common than H. Cantiana, and more re- 

 stricted in its range of habitation. 



7. Helix Pisana, Pisa Helix. 



Shell ; very narrowly umbUicated, subglobose, rather thin ; rusty or 



fawn-white, encircled with interrupted pen- 



ciliings of black, sometimes chestnut-filleted, 



spire rather obtuse, apex red-brown, whorls 



five, arcuately rudely striated, minutely de- 

 cussated with very fine spiral striae, convex ; 



aperture lunar-circular, lip simple, columellar 



margin rather broadly dilately reflected, 



sometimes, together with the body whorl, 



tinged with rose. 

 Helix Pisana,~NLiiRer (1774), Verm. Hist, part ii. p. 60. 

 Helix zonaria, Pennant (1777), Brit. Zool.-p. 137. pi. 



Ixxxt. f. 133. 

 Helix petholata, Olivi (1792) , Zool. Adriat. p. 178. 

 Helix rhodostoma, Draparnatid (1801), Tail. Moll. p. 74. 

 Helix cingenda, Montagu (1803), Test. Brit. p. 418. Supp. pi. xxiv. f. 4. 

 Helix strigata, Dillwyn (1817), Recent Shells, vol. ii. p. 911. 

 Theha Pisana, Eisso (1826), Hist. Nat. Europ. Merid. vol. iv. p. 73. 

 Helix allella, Fleming (1828), Brit. Anitn. p. 260. 

 Carocolla maculata, Menke (1828), Syn. Meth. Moll. p. 25. 

 Tela cingenda, Leach (1831), Turt. Man. p. 92. 

 Xerophila Pisana, Held (1837), Isis, p. 913. 



