TURBO TURBAN SHELL. 105 



thus place themselves out of the reach of the dash- 

 ing of the waves ; and on the contrary, that when 

 they make their descent into the sand, it is an 

 indication of a calm. The mollusk of the Peri- 

 winkle is striped with black ; is has two setaceous 

 tentacula annulated,* or streaked transversely 

 with black ; the eyes are at the base of the ten- 

 tacula and are very prominent. 



TURBO Scalaris.^ 



WENTLE-TRAP.J 



Specific Character. Shell turreted, with eight 

 rounded detached whorls, connected only by 

 elevated acute oblique ribs ; the aperture round, 

 outer line thickened, and reflected; the colour 

 snow-white, sometimes pale flesh colour : the size 

 varies from an inch and half to two inches in 

 length. The aperture is closed by a horny spiral 

 operculum. 



This elegant shell when perfect is valued at a 

 high price, on account of its rarity. The nu- 

 merous ribs mark the different periods of its in- 

 crease, and are in fact the reflected margins of 

 its former apertures, produced at its vavious 

 stages of growth. It is found in the warm seas 

 of the east. There is a shell which inhabits the 



* From annulus, the Latin word for a ring, 

 f Plate IV. figure 7. 



J A corruption of the German windel-treppe, a winding 

 staircase. 



