20.2 HELICIDyE. 



difficult to ascertain its exact distribution, because of a 

 variety of H. hispida being often mistaken for it. 



It seems to affect elevated as well as moist situations. 

 Puton found it on the Vosges mountains at a height of 

 about 3772 English feet. 



This shell is easily disting-uishable from H. hispida by 

 the globoseness of its form and greater height of the 

 spire, by being much more thin and of a lighter colour, 

 by the want of any keel or angularity, and by the thicker 

 and downy covering of hair. 



It is the H. hispida of Montagu, whose description of 

 the shell is, as usual, most accurate. He says " it is so 

 remarkably light and so covered with hairs, that when 

 let fall upon a hard body it is scarce heard." Beck is 

 of opinion that the H. sericea of Miiller is the young of 

 H, incarnata ; but the surface of immature shells of 

 that species is not hairy, but scaly or like seal-skin. 

 The present species appears to be the H. revelata of 

 Terussac ; and it is also the H. granulata of Alder, and 

 my H. globular is. 



13. H. REVELATA*, Michaud. 



H. revelata, Mich. Compl. p. 27, pi. xv. f. 6-8; r.& H. iv. p. 70, pi. cxix. 

 f. 1-3. 



Body pale yellomsh-grey, sometimes having a reddish or 

 dusky hue, closely tubercled : mantle yelloTvish-brown, minutely 

 speckled \\ith brown and milk-white : tentacles rather thick 

 and long, of a dirty-grey colour faintly tinged with violet or 

 brown ; the upper ones finely granidated, with globular bulbs : 

 foot rounded in front, triangular and keeled behind; sides 

 marked with transverse furrows. 



Shell subglobular, somewhat compressed above and rounded 

 below, very thin and semitransparent, rather glossy, yellowish- 

 green, marked with irregidar wrinkles in the line of growth, 



* Discovered. 



I 



