292 HELICID^. 



clausium of the genus Clausilia, though attached through 

 its whole length and inflexible/^ 



This species has been placed by different writers in no 

 less than eight genera^ and has received six specific 

 names. On the Continent it is more generally known as 

 Bulimus Menkeanus, in consequence of there being an- 

 other B. tridens ; but if the present species is not to be 

 placed in that genus, there can be no objection to retain 

 the original name given to it by Dr. Pulteney. 



B. Mouth destitute of teeth or folds : outer hp entire : 



mner lip thin. 



2. C. LU BRiCA*, Mliller. 



Helix lubrica, Miill. Verm. Hist. pt. ii. p. 104. Zua luhrica, F. & H. iv. 

 p. 125, pi. cxxT. f. 8, and (animal) pi. Gr. G. G. f. 5. 



Body broad and rounded in front, gradually narrowing and 

 very pointed behind, black or dark greyish-slatecolour above, 

 of a paler grey on the sides and underneath, shghtly tubercled : 

 mantle greyish-browai, closely speckled with milk-white : ten- 

 tacles broad at their base and slightly transparent ; upper pair 

 slender, finely and distinctly granulated, with very globular 

 bulbs ; lower pair of the same length as these bulbs and rather 

 thick : foot somewhat angular in front, not extending beyond 

 the neck ; sides very delicately edged with a dusky line and di- 

 stinctly speckled wdth milk-white ; tad f)omted and rather flat. 



Shell subcylindrical, wdth an approach to a turreted shape 

 in consequence of the base being wider than the top, nearly 

 transparent, very shining and lustrous, light yellowdsh-brown, 

 quite smooth and polished to the naked eye, but under a lens 

 marked with slight and curved transverse striae, especially near 

 the suture, and under a microscope very closely and faintly 

 striate in a spiral direction : periphery rounded in the adult, 

 very slightly angular in young specimens : epidermis exceed- 

 ingly thin: ivhorls 5 or 5|, tiunid, gradually increasing in 

 size, the last occupying about one-half of the shell : spire 

 produced, but rounded at the point : suture moderately deep, 



* Slippery. 



