Paul,
 
Yes. Nassa Lamarck is an invalid name so have to be replaced by
first subsequent available name: Nassarius.
 
Roding must be write with a diaeresis on the "o". An equivalent
spelling is Roeding without any diaeresis as "o" with diaeresis
(umlaut in german, if I remember well) sound "oe".
Ciao from Italy
Riccardo G.S.
 
 
>Thanks Gert!
>
>How interesting!  Apparently Lamarck proposed Nassa as a new genus
>for the species Linnaeus had named Buccinum mutabile (which we now
>know as Nassarius mutabilis), in 1799.  However, the Muricid genus
>Nassa, named by Roding, dates from 1798, just a year earlier!  I
>would guess (but will wait to hear from the pros) that this is why
>the Muricid genus Nassa is valid, but the Nassariid genus Nassa has
>been replaced by Nassarius.  This raises yet another mini-question.
>Is the author's name spelled Roding, or Roeding?  I see it both ways.
>
>Paul M.