14S IXTRODUCTIOX TO CONCHOLOGY. 



of his shelly and which, retaining its gum-like quality, 

 causes a variety of floating particles to become firmly glued 

 on its surface ; nay more, the shell is evidently moulded 

 with reference to this peculiarity. Hence the Carrier 

 Trochns is seen loaded with fragments of stones and shells, 

 corals, or such floating substances as are borne at random 

 by the waves. De Montford, therefore, in order to dis- 

 tinguish the Trochus agglutinans of Lamarck, a shell long 

 known to amateurs by the name of ^Mineralogist," and 

 *" Conchologist," according as its burden was composed 

 either of stones or shells, proposed the name of Phonis ; 

 and several species are now well known, in which the 

 glutinous property is differently exercised. The shell itself 

 varies materially from the Trochus tvpe, being nearly 

 colourless, not pearly, and of a more fragile texture ; 

 one or two species present a somewhat CalyjptrcEa^)^^ 

 aspect, but such evidently pertain to an animal of 

 locomotive habits, and the whorls are more completely 

 convoluted. 



Thames indicative of their peculiar burdens are, conse- 

 quently given to different shells. The P. onustus is covered 

 indiscriminately with stones, or shells, or corals; the 

 P. calculiferus, of which the gum-like exudation is re- 



