38 



It does not appear that either of them has been pre- 

 viously described. 



Mitra graniformis is the nearest given by Lamarck ; 

 it is longer and wants the transverse sulci. Voluta 

 obsoleta of Brocchi has a similarly ornamented surface 

 but it is much longer and sharper in form, and has but 

 three plaits upon the columella. 



