TURBO. 99 



still it is, or ought to be, without the slightest an- 

 gularity. Much as the cancellate and tapering 

 sections differ in outward properties of figure from 

 the preceding divisions, yet the internal chamber 

 is equally round and entire in all. There does not 

 appear, therefore, any just reason for separating 

 from the genus those species which are not defec- 

 tive in the principal generic character laid down ; 

 but some approach too near the Helix and other 

 tribes, to remain unmolested in their present situa- 

 tion. Doubtful species, of which there are unques- 

 tionably but too many, must be learnt by expe- 

 rience only. The exact limits of each genus should 

 be well understood, and then no great inconveni- 

 ence can arise from the errors of a catalogue. 



The name of this genus is as closely connected 

 with that of its predecessor, as are the individuals 

 which severally compose them ; Turbo signifying, 

 like Trochus, any thing which whirls round, a top. 

 Both genera are found among the rocks on craggy 

 shores, and on the sands, after a storm has 

 detached them from their accustomed refuge. 



