Purpura = purple ...
murex were the source of the famous purple dye made at Tyre.
Moneyers are the name we give to the
mint officials responsible for organising the annual coinage under the Republic (and also later under the Empire, except they weren't as prominent). Often their name or
part of their name appears on
Republican and Augustan coinage. At later times they also chose the
types, so you often see allusions to their family
history on their coins.
Steve