317 



at the upper end, as in that and the Ulvce: it never grows 

 to the fize of the latter, and exceeds that of the former. 



26. 

 Turbo eburneus. Adams Microfc.t. 14. f. 15. Ventrosus 



Walk. Min. Shells, f. 36. ^^^^ j2. f. 13. 



T. with a fmooth, gloffy, thin (hell, with fix ventri- 

 cofe, or much rounded volutions, of a light pellucid 

 horn-colour ; but when the animal is in it, the appear- 

 ance is black : apex moderately pointed : aperture fub- 

 orbicular, clofed by a thin, wrinkled, corneous opercu- 

 lum: margin almoftintire the whole way round. Length 

 one eighth of an inch ; breadth about one third its length. 



This fpecies is not uncommon on the Kentijfi coaft, at 

 Folkflone and Sandwich, confounded with T. Ulvce, for 



which we have received it. 



/ 



It is however perFefily diflinfl from that fliell, and 

 may be readily diftinguifhed by its flronglv elevated and 

 rounded volutions, gloffy appearance, and colour; the 

 other being always dull-brown, opaque; and vaftly 

 thicker. 



This (hell retains the greater part of its black colour 

 when preferved with the animal in; but dead fpccimens 

 are opaque white, as Mr. Walker defcribes it; and was 

 probably the only ftate in which Mr. Jacobs had ever 



feen 



