146 PNEUMONOBRANCHIATA. 



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



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



rather shining, grey, with a milk-white band 



across the aperture externally ; umbilicus minute. 



Helix Carthusiana. Miiller, Verm, 15., not Drap. 



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



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

 Man. ed. i. f. 27. 

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



4—6. 

 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 

 hriSHHk 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.) 



