CLAUSILIA. 185 



the margin white, and detached all round. Varies 

 with one or two additional minute denticles in the 

 mouth. 



M. Ferussac originally referred T. biplicatus Mont, 

 to C. ventricosa Drap. ; but he afterwards adopted the 

 opinion that they were distinct. The British shell is 

 more slender and spindle-shaped than the French ; 

 they are, perhaps, only local varieties ; but it is 

 extremely difficult to define the species of this 

 genus. 



This species was first described as British by 

 Montagu. 



85. 3. Clausilia Rolphii. Rolph's Close Shell. — 

 Shell ventricose, thin, opaque, red-brown, with 

 regular crowded raised stria? ; aperture with 

 four or five plaits, two of which are longer, 

 (t. 5. f. 54.) 



Clausilia (Iphigenia) Rolphii. Gray, Med. Repos. 1821, 182. — 

 Clausilia Rolphii. Leach, in Gray, Ann. Phil. 1825,413.; 

 Ferussac, Journ. Phys. 1820, 301.; Leach, Syn. Moll. 86. 

 t. 8. f. 9.; Alder, Mag. Zool. and Bot. ii. 111.; Turton, Man. 

 ed. 1. 71. f. 54.; Moq. Tand. Moll. Franc, ii. 343. t. 24. 

 f. 32—39. — Clausilia plicatula. Drap. Hist. p. 74. t. 4. 

 17, 18.?; Brard, p. 85. t. 3. f. 10. ?; Jeffreys, Limi. Trans. 

 xvi. 353.; Bossm. Icon. i. p. 39. f. 32., vii. f. 471—475.; 

 Furst. N. Act. Leap. xix. t. 58. f. 7. ; Forbes and Hanley, 

 B. M. iv. 120. t. 129. f. 3. — Turbo controversus. Alien, 

 Augsb. 18. t. 2. f. 3. — Stomodonta plicatula. Mermett, 

 Moll. Pyr. 47. — Clausilia Mortelleti. Diimont, 1853; 

 Schmidt, Ann. and Mag. N. H. xvii. 10. 1856; Prentice, 

 Ann. and Mag. N. H. xviii. 446. 



In damp places in woods, among the moss and 

 stones, under nettles and dogs' mercury, and on 

 trunks of trees, on a chalky soil. (Mr. Rolph, 1817.) 



