100 



BRITISH MOLLUSKS. 



3. Rolphii. Shell smaller, rather swollen, finely wrinkled through- 



out, light fulvous brown, additional small teeth in aperture. 



4. perversa. Shell small, narrowly acuminated, finely wrinkled 



throughout, dark chocolate-brown. 



1. Clausilia laminata. Laminated Clausilia. 



Shell ; cylindrically fusiform, transparent horny, rufous brown or 

 straw-colour, shining, whorls eleven to 

 twelve, depressly convex, smooth, ob- 

 scurely malleated, faintly obliquely stri- 

 ated; aperture fusiformly ovate, lip con- 

 tinuous, callously expanded, columella 

 strongly two-plaited, with four fine inter- 

 nal thread-like plaits within. 



Helix Helens, Midler (1774), Verm. Hist, part 2. 

 p. 116. 



Turbo bidens, Pennant (1777), Brit. Zool. ed. iv. 

 vol. iv. p. 131 (not of Linnseus). 



Bulimus bidens, Bruguiere (1792), JEnc. Meth. 

 Vers, p. 2. f. 352. 



Pupa bidens, Drapamaud (1801), Tabl. Moll. 

 p. 61. 



Turbo laminatus, Montagu (1803), Test. Brit. p. 359. pi. ii. f. 4. 



Clausilia bidens, Draparnaud (1805), Hist. Moll. p. 68. pi. iv. f. 5 to 7. 



Odostomia laminata, Fleming (1814), JEdin. Encyc. vol. vii. part i. p. 77. 



Clausilia (Marpessa) bidens, Gray (1821), Bond. Nat. Med. Repos. vol. 

 xv. p. 239. 



Clausilia ampla, Hartraann (1821), Syst. Oast. p. 50. 



Helix derugata, Ferussac (1822), Tabl. Syst. p. 67. 



Clausilia derugata, Jeffreys (1830), Trans.. Binn. Soc. vol. xvi. part ii. 

 p. 354. 



Clausilia lucida, Menke (1830), Syn. Moll. ed. ii. p. 129. 



Clausilia lamellata, Leach (1831), Brit. Moll. p. 118. 



Clausilia laminata, Turton (1831), Brit. Moll. p. 70. 



Clausilia (MarpessaJ laminata, Moquin-Tandon (1855), Hist. Moll. vol. ii. 

 p. 318. pi. xxiii. f. 2 to 9. 



Hab. Nearly throughout Europe. In England chiefly towards the south. 

 Eare in Ireland. Not in Scotland. (Mostly in beech woods, among 

 decayed leaves about the trunks of trees.) 



