Ross

I think that Martini and Chemnitz had figured most of the known species at
the time of their huge publication (1769-1795) and while their work is now
considered non binomial, at that time few accepted the Linnaean system and
the Martini/Chemnitz names were acceptable. Bear in mind also that
collecting was not as easy as it is today and it wasnt until the Cook
voyages (1768-1779) that new species again started to surface and
subsequently the voyages by Hugh Cuming in the 1800's flooded amature and
professional malacologists alike, such as the Sowerby's, Wood,  Reeve,
Adams, Hanley, Broderip, Dunker, Roemer, Deshayes and Smith EA with new and
undescribed material which would have been the result of so many species
being named in the 30 year period after Linnaeus.

Kev