Dear Ross Et Al;-
    The two Epitoniidae you are refering to are E. zelebori Dunker
1866 from New Zealand; and E. blainei Clench & Turner, 1950. Although
C&T placed blainei in Boreoscala, there isn't a cats whisker of
difference between the two species. Mix a few up and try to separate
them. You'll see.
         Art