196 HELICID^E. 



noticed by Montagu ; but as he evidently confounded 

 H. hispida with the present species in this stage of 

 growth, his statement that the young of H. rufescens was 

 covered with hairs was discredited. Capt. Bruce Hutton 

 has quite satisfied me on this point ; and the hairs are 

 very easily discerned with a lens of moderate power. 

 They are very short and caducous ; but the sockets of 

 the hairs, or the impression^ which are caused by their 

 insertion into the epidermis, remain on the surface of 

 full-grown specimens, and may be seen under a micro- 

 scope. M. Drouet has lately confirmed this fact of the 

 young shells being hispid. In some specimens from 

 Clifden, Co. Galway, the shell is finely striate in a 

 spiral direction. 



Having had an opportunity of observing in their native 

 habitats the H. circinnata, montana,&nd ccelata of Studer, 

 which appear to belong to one and the same species, I 

 am not inclined to consider them as varieties of H. ru- 

 fescens. Their spire is much more depressed and the 

 suture deeper than in the present species. I have, how- 

 ever, no doubt that the H. glabella of Draparnaud, and 

 probably also the H. clandestine!, of Hartmann, are the 

 same as our shell. The H. rufescens of Gmelin and 

 Grateloup are very different from this, the former being 

 a river shell and the latter an exotic species. 



10. H. CONCIN'NA*, Jeffreys. 



H. concinna, Jefir. in Linn. Trans, xvi. p. 336. H. hispida, var. con- 

 cinna, F. & H. iv. p. 70, pi. cxviii. f. 2, 3. 



BODY lustrous, reddish-brown, minutely tubercled or gra- 

 nulated : tentacles of a lighter colour ; upper pair larger and 

 more slender than in the next species (If. hispida) ; lower 

 ones very short : foot narrow, of a greyish colour on its 

 sides and sole. 



* Neat. 



