146 PNEUMONOBRANCHIATA. 



30. 12. HELIX Carthusiana. Gibbs's Snail, (t. 3. 



f. 27.) Shell depressed, semi transparent, bald 5 



rather shining, grey, with a milk-white band 



across the aperture externally ; umbilicus minute. 



Helix Carthusiana. Mutter, Verm. 15., notDrap. 



Carthusianella. Drap. p. 101. t. 6. f. 31, 32. 



and t. 7. f. 3, 4. ; Brard, p. 24. t. 1. f. 7.; Turt. 

 Man. ed. i. f. 27. 

 Teba Carthusianella. Leach, Moll. p. 95. t. 8. f. 



46. 

 Helix Zenobia bimarginata. Gray, Med. Rep. 1821. 



Gibbsii. Leach," Broivn, Brit. Shells, t. 40. 



f.49.51. 



Var. smaller, rather more convex. 

 Helix rufilabris. Jeffreys, Linn. Trans, xvi. 509. 

 On stunted grass, on the Downs in the chalky dis. 

 tricts of Kent and Sussex. 



Animal grey above, yellowish below ; tentacles long, 

 flexible. 



Shell not half an inch in diameter, more depressed 

 than the last, and not so glossy, without the 

 rufous stain about the mouth and under- 

 neath ; aperture more narrowed ; and the 

 umbilicus very minute; on the outside of the aperture 

 is a milk-white transverse band. 



This species varies considerably; in size, in the 

 thickness and the opacity of the shell, and in the dis- 

 tinctness of the double band round the mouth ; the 

 white band being most indistinct in the thinner spe- 

 cimens. 



Baron Ferussac, who received it from Dr. Leach, 

 under the above name (not H. Gypsii, as he prints it), 

 first recorded it as British (Journ. de Phys. xc. 300.) 



