CONTENTS 



Acknowledgments 3 



Deposition of types and figured specimens 4 



Part I. Introduction 7 



General statement 7 



Historical review 9 



Coastal features between Panama and the northwestern part of Peru 16 



Faunal provinces 23 



The Panamic-Pacific province, its limits and faunal characteristics 24 



The Peruvian province, its limits and faunal characteristics 32 



The Paita buffer zone with a list of its principal species 37 



Bibliography 40 



Part II. Panamic-Pacific Pelecypoda 



General statement 40 



Artificial key to principal families of Panamic-Pacific Pelecypoda 43 



Glossary of some common terms used in pelecypod descriptions 49 



Systematic treatment 52 



Order Palaeoconcha 52 



Superfamily Solemyacea 52 



Family Solemyidae 52 



Order Palaeotaxodontida 53 



Superfamily Nuculacea 53 



Family Nuculidae 53 



Family Nuculanidae [[ 58 



Family Nucinellidae '...' 71 



Order Eutaxodontida 73 



Superfamily Arcacea 73 



Family Arcidae 73 



Family Glycymeridae 103 



Limopsidae 109 



Order Dysodontida (Anisomyaria) 110 



Superfamily Mytilacea 110 



Family Mytilidae 110 



Family Dreissenidae 139 



Family Juliidae (Opistobranchia Sacoglossa) 141 



Order Isodontida 143 



Superfamily Pteriacea 143 



Family Pinnidae 143 



Family Pteriidae 145 



Family Philobryidae 147 



Family Isognomonidae 149 



Superfamily Pectinacea 149 



Family Spondylidae 150 



Family Plicatulidae 153 



Family Pectinidae 155 



Family Amusiidae 168 



Superfamily Limacea 169 



Family Limidae 169 



Superfamily Ostracea 171 



Family Ostreidae 171 



Superfamily Anomiacea 175 



Family Anomiidae 175 



Order Heteredontida 179 



Superfamily Astartacea 179 



Family Crassatellidae 179 



Superfamily Carditacea 184 



Family Carditidae 184 



Family Condylocardiidae 190 



