236 HELIClDiE. 



light-brown with a yellowish tint, but varying in intensity of 

 colour, faintly and irregularly striate in the line of growth, 

 and marked spirally ^ith fine and close-set but undulating 

 lines, which, being intersected by the transverse striae, give the 

 surface a slightly shagreened appearance : periphery rounded, 

 but compressed : epidermis rather thick : whorls 7^? somewhat 

 compressed, the last forming nearly one-half of the shell: 

 spire tapering, but somewhat abruptly, blunt at its extremity : 

 suture rather slight and obhque : mouth oval, a little con- 

 tracted on the inner side by the penultimate whorl : outer lip 

 white, reflected and considerably thickened within, where it is 

 of a reddish-brown colour : umhiUcus nearly covered by the 

 reflexion of the pillar lip, rather obhque, and deep. L. 0-65. 

 B. 0-225. 



Habitat : On trunks of trees, chiefly of beech, ash, and 

 hornbeam, in the woods of our southern and western 

 counties. It is local, although tolerably plentiful where 

 it occurs. At Buriton in Hampshire it is found with 

 Helios obvoluta and Clausilia Roljjhii. The locality given 

 in the Appendix to Welch and Whitelaw^s ' History of 

 Dublin ' (viz. " neighbourhood of Dublin ") is very ques- 

 tionable, as the occurrence of this shell in Ireland has 

 not been noticed by Mr. Thompson or Mr. Waller. As a 

 tertiary shell it has only been discovered in the CI acton 

 deposit. Its foreign distribution appears to be limited 

 to the North and East of France, as well as the Pyrenees, 

 Germany, Switzerland, and Silesia, in all of which coun- 

 tries it is only known to inhabit elevated situations. 



The colour both of the body and shell varies in in- 

 tensity. In immature specimens the periphery is keeled. 

 The young are sometimes encrusted with earth in the 

 same manner as B. obscurus. 



It is the Helix Lackhamensis of Montagu ; but his 

 name is subsequent to that of Draparnaud and is, be- 

 sides, objectionable on account of its being derived from 

 a very obscure locality, which was not the first recorded 

 for the discovery of this species. 



