Lichida.
Phacopida.
Corynexochida.
Ptychopariida.
Asaphida.
Proetida.
Redlichiida.
Harpetida.
...Agnostida.
Which kind of Trilobite are you?
If you couldn't answer that question in .000000001 seconds --
Then maybe Richard Fortey and George Korein need to fill you in about Trilobites(!).
One's got a book, the other's an Infidel?/Castrati!
Questions?
(trilonaut DON'T SPAM, PUNK at yahoo dot com)