A couple of questions about family names: I don't think ICZN rules apply to family names? Is that right? Yet family names almost always seem to be derived from a genus name within the family. Is this just sort of a tradition, or are there any rules or guidelines governing it? What about a family name like Potamididae? As far as I know, there is no genus name that is similar. Where does such a name come from? One last question - when it was decided to divide the Cymatiidae into two families, why was Personidae chosen for the other family, given that Persona is no longer a valid genus name? Why wasn't it called Distorsiidae, after Distorsio, the current and valid equivalent? Paul M.