112 



Diameter half an inch [from the extremity of the 

 aperture to the apex of the shell]. 

 Colour of the animal dark grey. 

 A very distinct variety [which was considered by 

 Draparnaud, Alder, and Grey to be a difierent species, 

 and named by them Claiisilia dubia'\ is occasionally 

 found, but not hitherto in this neighbourhood. It at- 

 tains a greater size, is more tumid, and pale brown in 

 colour. Professor Forbes, in his British Mollusca, has 

 recorded it as only a variety ol the Clausilia nigricans. 



Another variety iClausilia parvula of Leach, Turton, 

 and Jeffreys] is smaller and more delicate; and a third 

 variety [^Clausilia Everettii of Miller] has a less number 

 ofconvolutions, and is shorter in length. 



Neither of the latter named varieties differ so much 

 as that of C. dubia. 



An inhabitant of old walls, and sometimes old trees. 

 Specimens sent from Newcastle by Mr. Alder, and 

 Penzance by Mr. Millett, did not vary from those 

 found in this neighbourhood. 



Our localities are Stanton-on-the- Wolds, Bulwell^ 

 Thrumpton, and Highfield Hoase. 



Other recorded ones are Penzance (Millett), Dorset- 

 shire, Wiltshire, and Kent (Montagu), Bristol (Miller), 

 Essex (Sheppard), Norwich (Bridgman), Dinton Hall, 

 Bucks. (Goodall), Hartwell, Bucks. (Horton), London 

 (Grey), Calke Abbey, Derbyshire (Bloxam), Heights of 

 brahara, at Matlock (R. Enfield), Chaigeley Manor, 

 Lancashire (Winstanley), Lytham, Lancashire (The 

 Author), Kendal (Gough), Newcastle (Alder). 



Dublin (Brown), Belfast (Thompson), common in 

 Ireland (Forbes), Isle of Man (Forbes). 



On the Continent, found in France (Draparnaud)^ 

 Germany (Pfeiffer), Corsica (Payradeau), and Swedea 

 (Nilson). 



