ONTOGENETIC MODULARITY AND METAMORPHOSIS IN AN ORDOVICIAN TRILOBITE
VARGAS-PARRA, Ernesto, Division of Paleontology, American Museum of Natural History, 200 Central Park West, New York, NY 10024 and HOPKINS, Melanie, Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192