TURBINELLUS. 



Iiave the power of eroding or abrading or absorbing the 

 calcareous matter which they have deposited in forming 

 their shells, when they have no further use for it : for three 

 rows of tubercles from the lower part of the whorl are 

 gradually destroyed as the animal increases its inner lip, 

 and in their place are formed the folds of the Columella. 



The Turhinelli are marine. We are not aware that 

 any have yet been found fossil, though they might be e^^;-. 

 ' p^cted in the marine strata above the ch^lk. 



