100 



which will obviate the neceflity of pointing out their great 

 difllmilarity ; for whether this is really Britifh or not, it be- 

 comes ellential to prevent the two fpecies being confounded, 

 fince the triplicaUi has been referred to for denticulata in the 

 Lumean Tranfadlion, Vol. viii. p. I3O. 



BiDEXTATA. Shell ftrong, thick, conic, and ^of a pure white, with fix 

 Tab. 29. f. 3. or feven moderately fmooth, and fomewhat glolly volutions, 

 wrought with a few diftant lono-itudinal wrinkles that an- 

 dulate the feparating line ; the firft or body whirl is two 

 thirds of its length : the apex pointed : aperture narrow, 

 about half the length of the fhell, contracted at the upper 

 angle ; lips thick ; columella much thickened, and folding- 

 back forms a Juh-umhtlicus , and is furniflied with teeth-like 

 plications. Length a quarter of an inch. 



We are obliged to Mr. Laskey for pointing out this new 

 fpecies of VolutUy which he difcovered on the Scoti/Jj coaft, 

 near Dunbar, but obferves it is rare, and only found after a 

 tempefluous fea. Since we received fpecimens from that 

 gentleman we have difcovered it alive on the coaft oi Devon, 

 confiderably more plentiful, but fcarcely fo large ; and never 

 mixed with Valuta denticulata. 



This fpecies much more refembles V. denticulata than 

 V. triplicata will be found to do, and though fo nearly allied 

 to it there are fufficient invariable chara6teriflic diftinc^lions 

 by which they may readily bediflinguifhed, It differs in being 



generally 



