FAMILY COLIMACEA. 91 



3. Bulimus obscurus. Concealed Bulimus. 



Shell ; acurninately cylindrical, slightly turricidated, minutely urn- 



bilicated, fuscous horny, semitransparent ; 



whorls six and a half to seven, very finely 



obliquely striated ; aperture small, lip some- 

 what squarely ovate, lip callously expanded, 



shining white, dilated next the umbilicus, 



margins inclined to approximate. 

 Helix obscura, Miiller (1774), Verm. Hist, part 2. p. 



103. 

 Turbo rupium, Da Costa (1778), Test. Brit. p. 90. 

 Bulimus hordeaceus, Bruguiere (1789), Tine. Meth. 



Vers, p. 331. 

 Helix stagnorum, Pulteney (1799), Cat. Dorset, p. 49. pi. xix. f. 27. 

 Bulimus obscurus, Draparnaud (3 801), Tabl. Moll. p. 65 (not of Poiret). 

 Lymncea obscura, Fleming (1814), Edin. TJncyc. vol. vii. part 1. p. 78. 

 Una obscura, Leach (1831), Brit. Moll. p. 113. 

 Buliminus obscurus, Beck (1837), Ind. Moll. p. 71. 

 Merdigera obscura, Held (1837), Isis, p. 917. 



Bulimus Astierianus, Dupuy (1849), Hist. Moll. vol. iii. p. 320. pi. xv. f. 7. 

 Bulimus (EnaJ obscurus, Moquin-Tandon (1855), Hist. Moll. vol. ii. p. 291. 



pi. xxi. f. 5 to 10. 

 Bulimus Humberti, Bourguignat (1857), Rev. et Mag. de Zool. No. 1. 



Amen. Malac. vol. i. p. 28. pi. ii. f. 5 to 7. 

 Hab. Throughout Europe. Siberia. (In old walls and among ruins, under 



stones, in woods, on trees, and among moss.) 



A species of general occurrence throughout Britain and the Con- 

 tinent, reaching across Siberia to the district of the A moor. The 

 shell is much smaller than that of B. montanns, and is composed of 

 about half a whorl less, convoluted in a more turriculate cylin- 

 drical manner. The surface, not being shagreened, is more trans- 

 parent and glossy, and the reflected margin of the aperture is more 

 callously expanded. 



The animal is grey or dark mottled, somewhat roughly tubercled 

 for its size, and discharges a rather copious supply of mucus over 

 its shell, which is frequently encrusted from this cause by dirt and 

 such other substances as may become agglutinated to it. " It is 

 slow and sluggish," says M. Moquin-Tandon, "in its habits, irrit- 

 able, delighting in moisture, and carrying its shell horizontally 

 when crawling." 



