TURBO TURBAN SHELL. 105 



out of the reach of the dashing of the waves ; and 

 on the contrary, that when they make their de- 

 scent into the sand, is is an indication of a calm. 

 The mollusk of the Periwinkle is striped 

 with black ; it has two setaceous tentacula annu- 

 lated,* or streaked transversely with black ; the 

 eyes are at the base of the tentacula and are 

 very prominent. 



TURBO Scalaris.^ 



WENTLE-TRAP.t 



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 

 numerous ribs mark the different periods of its 

 increase, and are in fact the reflected margins 

 of its former apertures, produced at its various 

 stages of growth. It is found in the warm seas 

 of the east. There is a shell which inhabits the 

 European and American Seas, and is found upon 



* From annulus, the Latin word for a ring, 

 t Plate IV. figure 7. 



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

 staircase. 



