162 SPECIFIC 



Specimen whitish, mottled with olive green and 

 black ; inside pearlaceous ; 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 

 belonging to the species, as the striae are precisely 

 of the same description. 



Fig. 2. (interior and exterior) H. impertusa. 



Shell oblong, imperforate ; very finely striate 

 transversely and longitudinally ; back convex. 



Specimen rose-colour, clouded and speckled 

 with cinereous, having four dusky bands inter- 

 rupted by yellow angular spots and lines ; inside 

 pearlaceous. 



This beautiful little shell is justly entitled to the 

 designation impertusa, being not only imperforate, 

 but having no impression of an orifice; yet will it 

 hardly be denied a place in the genus Hnliotis by 

 any one who attentively inspects it. 



