COLIMACEA. 63 



Sub- Genus 4. — Helicella, — Ferussac. 



Shell depressed; base of the body provided with a large um- 

 bilicus. 



10. Helix Cantiana, pi. VII, f. 8, 9, 10. 



Helix Cantiana, Montagu, Test. Brit., p. 422, pi. 23, f. 1 ; 

 Maton and Rackett, Linn. Tr., VIII, p. 197; Turton, Brit. Fau., 

 p. 189; Brown, Ency. Brit., 6th Ed., VI, p. 457; Fleming, 

 Edin. Ency., VII, p. 79; lb., Brit. An., p. 261 ; Teba Cantiana, 

 Leach, Moll., p. 94 ; Helix Carthusiana, Drapernaud, p. 102, 

 pi. 6, f. 33; Turton, Man., p. 36, pi. 3, f. 26; Alder, Mag. Zool. 

 and Bot., 11, p. 106; Brard, p. 24, pi. 1, f. 6; Ferussac, Prod., 

 p. 43 ; Rossmassler, V, VI, p. 36, pi. 27, f. 364 ; Helix pallida, 

 Donovan, Brit. Sh., V, pi. 157, f. 2; Helix circinnata, Ross- 

 massler, I, p. 64, pi. 1, f. 12; Helix Cantiana, Brown, lUust. 

 Conch., p. 46, pi. 17, f. 15, 16, 17; lb.. First Ed., pi. 40, f. 15, 

 16, 17. 



Shell subpellucid, thin, generally of a yellowish-white, but 

 sometimes lead-coloured ; body large, tumid, with an obscure 

 central band ; the base and aperture of a rufous colour ; spire 

 small, subdepressed, consisting of five moderately rounded 

 volutions; aperture semielliptical, its length and width being 

 nearly equal; outer lip thin, but not reflected; internal rib of a 

 pale rose-colour, or white ; whole surface covered with minute, 

 irregular, longitudinal striae; umbilicus rather small. Diameter 

 three-quarters of an inch ; height about half an inch. 



Young shells are very pale in the colour, and with the epi- 

 dermis slightly hispid. The adult bears some resemblance to 

 H. rufescens, but may be distinguished by its greater con- 

 vexity, superior size, in the striae less regular and strong, in 

 being devoid of the subcarinated band round the body, and in 

 the umbilicus being considerably less in proportion to its size. 



This species frequents the chalk districts of Kent, and is an 

 extremely local shell. 



11. Helix Carthusiana, pi. VII, f. 11, 12, 13. 



Helix Carthusiana, Miiller, Verm., p. 15; Helix Carthiisi- 

 anella, Drapernaud, p. 101, pi. 6, f. 31, 32 ; Alder, Mag. Zool. 

 and Bot., II, p. 106; Brard, p. 24, pi. 1, f. 7; Turton, Man., 

 p. 37, f. 27; Helix Gibsii, Leach, in Brown, Illust. Conch., 1st 



