CLAUSILIA. 173 



species) which occur on walls or rocks is much more 

 frequently smooth than that of specimens found on 

 trees, and consequently I infer that the partial absence 

 of striae is due to the friction created when the 

 animal trails its shell along the hard surface of the 

 stones. In the 'Scottish Naturalist' for July, 1872, 

 Dr. Grant Guthrie states that this species occurs on 

 Ben Lawers, in Perthshire, at an elevation of 2400 

 feet. 



Var. I. albida. — Shell greenish-white, with a few white trans- 

 verse lines. Dinton Hall, Bucks (Goodall),^.C. Near Gisling- 

 ham, Suffolk (Blatch), Pateley Bridge, Yorkshire (Lister Peace), 

 near Birmingham (G. Sherriff Tye), J.C. Near Loch Awe 

 (McMurtrie), Colchester (R. R.). 



Var. 2. Everetti, Miller. — Shell smaller. Bristol (Miller), 

 Whalsey Skerries, Zetland, Giant's Causeway and Co. Tyrone 

 (J. G. J.), B.C. Near Birmingham (G. Sherriff Tye), J.C. Perth 

 (Grant Guthrie). 



Var. 3. ^r^^z7/^r.— Shell longer and more slender. Battersea 

 Marshes (J. G J.), B.C. 



Var. 4. tumidnla. — Shell smaller, shorter and more ventricose. 

 Brockley Combe near Bristol, and Connemara (J. G. J.), B.C. 

 Perth (Grant Guthrie). 



Var. 5. diibia, Drap. — Shell larger and more ventricose. 

 Northumberland and Durham (Alder), Oxfordshire (Whiteaves), 

 Ingleborough, Yorkshire (Dixon), B.C. 



Var. 6. Schlechtii, Zelebor. — Shell "generally larger, more 

 elongated, smoother, and more transparent than var. dubia, of a 

 pale brown, frequently resembling in external appearance Clau- 

 silia lamiiiata both in smoothness and transparency," J.C.^ 

 No. IIL, p. 36. This variety was discovered in 1874 by Mr. 

 W. D. Sutton in the counties of Northumberland and Durham. 



Monst. dextrorsa. — Shell resembling a Pupa in shape, spire 

 dextral. Sevenoaks, Kent (Smith), B.C, 



