About Hallucigenia--although the name indeed refers to the strange appearance as Walcott (and even SJ Gould) saw it, later work showed that there were two rows of tube feet, and two rows of spines. In other words it's not quite so mysterious how it walked (although there is still no way of knowing which end is which).

And "Dave": a) anthopologists don't name trilobites, palaeontologists do (anthropologists rarely name any species, since they study humans); b) there has to be a genus and species name, usually the species (second) part of the name is used to honour someone/something/somewhere. They can't just officially call a species "Bob", that won't work.