292 



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 o'r folds : outer lip entire : 

 inner lip thin. 



2. C. LU'BRICA*, Miiller. 



Helix liibrica, Miill. Verm. Hist. pt. ii. p. 104. Zua lubrica, 

 F. & H. iv. p. 125, pi. cxxv. f. 8, and (animal) pi. G. 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, slightly 

 tubercled : mantle greyish-brown, closely speckled with 

 milk-white : tentacles broad at their base and slightly trans- 

 parent ; 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 distinctly speckled with milk- 

 white ; tail pointed and rather flat. 



SHELL subcylindrical, with an approach to a turreted shape 

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

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

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

 lens marked with slight and curved transverse striae, especi- 

 ally 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 exceedingly thin: whorls 5 or 5|, tumid, gradually 

 increasing in size, the last occupying about one-half of the 

 shell : spire produced, but rounded at the point : suture 



* Slippery. 



