FAMILY COLIMACEA. 103 



Forbes and Hanley considered it identical with, a widely diffused 

 Continental species, C. plicatula, Draparnaud, but that has a 

 smaller and more slender shell ; and the aperture in C. Rolphii is 

 distinctly characterized by the presence of three, and sometimes four, 

 fine marginal plaits between the teeth. 



4. Clausilia perversa. Reversed Clausilia. 



Shell; slenderly acuminately fusiform, dark shining chocolate- 

 brown, subtransparent, marked at intervals 

 near the sutures with short indistinct whitish 

 hair lines, whorls ten to eleven, flatly con- 

 vex, densely striately wrinkled throughout ; 

 aperture obliquely pyriformly ovate, lip cal- 

 lously expanded, columella widely two- 

 plaited, with two or more fine internal 

 thread-like plaits within. 



Helix perversa, MUHer (1774), Verm. Hist, part 2. p. 



118 (not of Linnseus, Chemnitz, nor Ferussac) . ^P ,v->\ 



Turbo perversus, Pennant (1777), Brit. Zool. p. 130. 



Bulimus perversus, Bruguiere (1792), Enc. Meth. vol. ii. 

 p. 351. 



Pupa rugosa, Draparnaud (1801), Tail. Moll. p. 63. 



Clausilia rugosa and dubia, Draparnaud (1805), Hist. Moll. p. 70 and 73. 

 pi. iv. f. 10, 19, 20. 



Turbo nigricans, Maton and Backett (1807), Trans. Linn. Soc. vol. viii. 

 p. 180. 



Odostomia nigricans, Fleming (1814), Edin. Encyc. vol. vii. part i. p. 77. 



Clausilia roscida and cruciata, Studer (1820), Kiwz. Yerz. p. 20. 



Clausilia ohtusa, C. Pfeiffer (1821), Deutsch. Moll, part i. p. 65. pi. hi. 

 f. 33, 34. 



Clausilia Everettii, Miller (1822), Ann. Phil, new series, vol. hi. p. 377. 



Clausilia parvula, Turton (1826), Zool. Journ. vol. ii. p. 566. 



Clausilia nigricans, Jeffreys (1830), Trans. Linn. Soc. vol. xvi. p. 351. 



Stomodonta rugosa, Mermet (1843), Moll. Pyr.-Occid. p. 147. 



Clausilia abietina and Beboudii, Dupuy (1851), Hist. Moll. vol. v. p. 356 

 and 358. pi. xvh. f. 5. and pi. xviii. f. 3, 4. 



Clausilia (Iphigena) perversa and nigricans, Moquin-Tandon (1855), Hist. 

 Moll. vol. h. p. 332 and 334. pi. xxiv. f. 17 to 27. 



Hab. Throughout Europe. (In the crevices of walls, rocks, and trees, and 

 under stones.) 



