1G2 SPECIFIC 



Specimen whitish, mottled with olive green and 

 black ; inside perlaceous ; six orifices open. 



Inhabits the European, Atlantic, and Indian 

 oceans. 



The varieties of this species are very numerous, 

 and differ much at the different stages of their 

 growth. The specimen figured is less than usually 

 tuberculate or plaited, and is somewhat flatter at 

 the side ; but still there is little doubt of its be- 

 longing to the species, as the string are precisely of 

 the same description. 



Fig. 2. {interior and exterior) II. impertusa. 



Shell oblong, imperforate; very finely striate 

 transversclv and longitudinally; back convex. 



Specimen rose-colour, clouded and speckled 

 with ciucrcou'<, having four dusky bands interrupt- 

 ed by yellow angular sj)ots and lines; inside per- 

 laceous. 



This beautifid little shell is justly entitled to the 

 designation impcrtusa, being not only imperforate, 

 l)ut having no impression of an orifice ; yet will it 

 bardlv be denied a place iii the genus Ilaliotis by 

 any one who attentively inspects it. 



