196 " HELICID^. 



noticed by Montagu; but as he evidently confounded 

 H. hispida "v^dth the present species in tbis stage of 

 growth^ bis statement tbat the young of H. rufescens was 

 covered witb bairs was discredited. Capt. Bruce Hutton 

 bas quite satisfied me on tbis point ; and tbe bairs are 

 very easily discerned witb a lens of moderate power. 

 Tbey are very sbort and caducous ; but tbe sockets of 

 tbe bairs, or tbe impressions wbicb are caused by tbeir 

 insertion into tbe epidermis, remain on tbe surface of 

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

 scope. M. Drouet bas lately confirmed tbis fact of tbe 

 young sbells being bispid. In some specimens from 

 Clifden, Co. Galway, tbe sbell is finely striate in a 

 spiral direction. 



Having bad an opportunity of observing in tbeir native 

 babitats tbe H. circinnata, montana, and ccelata of Studer, 

 wbicb appear to belong to one and tbe same species, I 

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

 fescens. Tbeir spire is mucb more depressed and tbe 

 suture deeper tban in tbe present species. I bave, boAv- 

 ever, no doubt tbat tbe H. glabella of Draparnaud, and 

 probably also tbe H. clandestina of Hartmann, are tbe 

 same as our sbell. Tbe H. rufescens of Gmelin and 

 Grateloup are very different from tbis, tbe former being 

 a river sbell and tbe latter an exotic species. 



10. H. coNciN^NA^, Jeffreys. 



H. concinoia, Jeffr. in Linn. Trans, xvi. p. 336. H. hispida, var, concinna, 

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



Body histrous, reddish-brown, minutely tubercled or gra- 

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

 more slender than in the next species {H. hispida) ; lower 

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



and sole. 



* Neat. 



