VOL. 46, NO. 2 MALACOLOGIA 2004 CONTENTS PAULA M. MIKKELSEN & RÜDIGER BIELER International Marine Bivalve Workshop 2002: Introduction and Summary. 241 OSMAR DOMANESCHI & ELIZABETH K. SHEA Shell Morphometry of Western Atlantic and Indo-West Pacific Asaphis; Functional Morphology and Ecological Aspects of A. deflorata from Florida Keys, U.S.A. (Bivalvia: Psammobiidae) . 249 JOHN D. TAYLOR, EMILY GLOVER, MELITA PEHARDA, GREGORIO BIGATTI & ALEX BALL Extraordinary Flexible Shell Sculpture: the Structure and Formation of Calcified Periostracal Lamellae in Lucina pensylvanica (Bivalvia: Lucinidae) . 277 BRIAN MORTON & MARTINA KNAPP Predator-Prey Interactions between Chione elevata (Bivalvia: Chioninae) and Naticarius canrena (Gastropoda: Naticidae) in the Florida Keys, U.S.A. 295 LISA KIRKENDALE, TAEHWAN LEE, PATRICK BAKER & DIARMAID Ó FOIGHIL Oysters of the Conch Republic (Florida Keys): A Molecular Phylogenetic Study of Parahyotissa mcgintyi, Teskeyostrea weberi and Ostreola equestris . 309 P. GRAHAM OLIVER & JOHANNA JÄRNEGREN How Reliable is Morphology Based Species Taxonomy in the Bivalvia? A Case Study on Arcopsis adamsi (Bivalvia: Arcoidea) from the Florida Keys . 327 PAUL VALENTICH-SCOTT & GRETE ELISABETH DINESEN Rock and Coral Boring Bivalvia (Mollusca) of the Middle Florida Keys, U.S.A. 339 LUIZ RICARDO L. SIMONE & ANTON CHICHVARKHIN Comparative Morphological Study of Four Species of Barbatia Occurring on the Southern Florida Coast (Arcoidea, Arcidae) . 355 MATTHEW R. CAMPBELL, GERHARD STEINER, LYLE D. CAMPBELL & HERMANN DREYER Recent Chamidae (Bivalvia) from the Western Atlantic Ocean . 381 GREGORIO BIGATTI, MELITA PEHARDA & JOHN TAYLOR Size at First Maturity, Oocyte Envelopes and External Morphology of Sperm in Three Species of Lucinidae (Mollusca: Bivalvia) from Florida Keys, U.S.A. 417 RÜDIGER BIELER, ISABELLA KAPPNER & PAULA M. MIKKELSEN Periglypta listeri (J. E. Gray, 1838) (Bivalvia: Veneridae) in the Western Atlantic: Taxonomy, Anatomy, Life Habits, and Distribution . 427 LUIZ RICARDO L. SIMONE & JOANNE R. DOUGHERTY Anatomy and Systematics of Northwestern Atlantic Donax (Bivalvia, Veneroidea, Donacidae) . 459 PAULA M. MIKKELSEN, ILYA TËMKIN, RÜDIGER BIELER & WILLIAM G. LYONS Pinctada longisquamosa (Dunker, 1852) (Bivalvia: Pteriidae), an Unrecognized Pearl Oyster in the Western Atlantic . 473 RÜDIGER BIELER & PAULA M. MIKKELSEN Marine Bivalves of the Florida Keys: A Qualitative Faunal Analysis Based on Origi- nal Collections, Museum Holdings and Literature Data . 503 PAULA M. MIKKELSEN & RÜDIGER BIELER Critical Catalog and Annotated Bibliography of Marine Bivalve Records for the Florida Keys . 545.