PLATE CXXXVIII. 



aperture, and calls it the double-toothed Turbo ; although from its 

 plaited pillar, it is evidently a Volute : and the third plait, which with 

 the two others, characterize the species, is obviously too large to have 

 been overlooked. Da Costa, we are persuaded, thought they were 

 both the same, for in a MS. note attached to this shell in his collec- 

 tion, he says, "This shell is figured by Walker," and certainly no 

 figure in the volume of that Author corresponds with it, except that 

 to which we refer above. 



Walker speaks of his shell as being very common on the roots of 

 rushes, in marshes, near Faversham : The habitat of our shell we 

 have not been able to ascertain, having never found it in a living 

 state,. 



