Emilie,
 
I cannot help with the Cantharus, but Tom Rice in an old price list has
the murex as Murex (Haustellum) anniae (M. Smith, 1940).  Note the
slight difference in spelling in anniae.
 
Tom Eichhorst in New Mexico, USA
 
Emilie Sower wrote:
>
> I have two shells which someone provided a name for but I can not locate in my
> limited library.  Could someone help me with the author & date and verify that
> I understood the spelling?
>
> Cantharus harasewychi
> Murex Annae
>
> Thanks in advance for your help!
>
> Em
> Nokomis, FL