102 UNIVALVES. 



this shell, that it accumulates, during v its forma- 

 tion, different foreign substances, and is often 

 found covered with stones, coral, small shells, and 

 fragments of shells ; on account of this curious 

 property 'of accumulating, it has acquired the 

 name of the Carrier. It has not been ascertained 

 how this animal, during the formation of its shell, 

 collects these various substances ; probably some 

 very tenacious matter is combined with its calca- 

 reous secretions, so that, whatever comes in con- 

 tact with it before it is hardened, adheres to its 

 surface. 



Genus TURBO* Plural, Turbines. 



TURBAN- SHELL. 



Generic Character. Shell univalve, spirally 

 convoluted, solid ; shape more or less conical ; 

 aperture entire, contracted, orbicular. 



OBSERVATIONS ON THE SHELL AND ITS 

 INHABITANT. 



The shells of this and the preceding genus are 

 often so similar, that it is difficult to define the 



* Plate IV. figures 7, 8. 



