204 HELICID^. 



of air from the atmosphere. The winter covering is 

 thicker^ opaque, and nearly white. 



This is another instance of rather conspicuous land- 

 shells having been overlooked in places where observant 

 naturalists had long searched and obtained much smaller 

 species. Col. Montagu especially investigated the Tes- 

 tacea of our Southern counties ; and these have always 

 been a favourite haunt of our field or outdoor concho- 

 logists. The H. revelata was for the first time noticed 

 as a British species by Dr. Gray in 1840, in consequence 

 of the late Professor Edward Forbes having found it 

 in Guernsey and presented specimens to our National 

 Museum. 



The H. revelata of Ferussac, who first used this name, 

 is (as I have before observed) the H. sericea of Miiller ; 

 but Michaud afterwards described and figured the pre- 

 sent species under the same name, supposing it to be 

 Ferussac's species. It therefore appears unnecessary 

 to adopt the name either of Ponentina or occidentalism 

 which were subsequently (in 1845) applied to this species 

 by Morelet and Recluz. The H. revelata of Bouchard- 

 Chantereaux is our H. fusca, of which I had an oppor- 

 tunity of satisfying him soon after the publication of 

 his excellent Memoir on the Land and Freshwater Mol- 

 lusca of the Pas-de-Calais. Some shells which I noticed 

 in the collection of M. D^Orbigny at Rochelle, in 

 1830, as having been received by him from Draparnaud, 

 under the name of H. sericea (two of which he kindly 

 presented to me and are now in my possession), belong 

 to the present species, and occasioned the remark which 

 I made in the Supplement to my paper in the ' Linnean 

 Transactions^ (vol. xvi. p. 507) as to the H. sericea of 

 the last-named author. Michaud's work was not pub- 

 lished until 1831. 



