118 UNIVALVES. — TURBO. 



Reversed Shells. 

 Perversus — Reversed. Ventiicosus — Bellied. 



Pusillus — Minute. Annulatus — Annulated. 



Undulatus — Waived. Lunaris — Hor7i- coloured. 



TURBO.— Wreath. 



Animal — aLimax: Shell univalve , spiral, solid : aperture 

 contracted, orbicular, entire. 



THERE are no less than one hundred and sixty-seven 

 species of this beautiful genus ; which are, for the most part, 

 solid and ponderous shells, and many of them of a pearly 

 nature when uncoated. They resemble the Trochus in 

 form, but may easily be distinguished by their suborbicu- 

 lar aperture. 



The first division has the pillar margin of the aperture 

 dilated, and the pillar imperforate. Among the leading 

 species may be enumerated the T. obtusatus, T. neritoides, 

 and the T. littoreus, or common periwinkle, a well known 

 British shell: its fish, when boiled, is not unfrequently 

 eaten. It is an inhabitant of most European shores; and 

 it is said of them by sailors, that, if seen crawling high up 

 the rocks, it is an indication of the approach of stormy 

 weather; but if, on the contrary, they descend, a calm 

 may be expected. 



The next division consists of the solid and imperforated 

 species: among the principal are the T. petholatus, T. 

 chrysostomus, T. pagodus, T. calcar, and T. smaragdus ; to 

 which may be added, the T. cochlus, T. cornutus, T. mar- 

 moratus, and T. olearius, the two latter of which sometimes 

 attain a large size. 



