4 CONTENTS 



PAGE 



Australia 35 



Siluric 35 



Upper Siluric 35 



Germany 35 



Carbonic 35 



Middle Saarbriicker 35 



South America 36 



Carbonic 36 



Coal Measures of Brazil 36 



Africa 36 



Devonic 36 



Witteberg series 36 



Portugal 37 



Permic 37 



Summary Tables 37 



Table I. Geological and Geographical Distribution of the Eurypterida 



throughout the World 37 



Table II. Summary of the Geological and Geographical Distribution 



of the Eurypterida throughout the World 37 



Table III. Summary of the Distribution, Facies and Mode of Occur- 

 rence of the Eurypterida 38 



Synonymy 50 



Chapter II. A Resume of the Opinions on the Habitat of the Eurypterida. 52 



Chapter III. The Bionomy of the Eurypterid Faunas 64 



Introduction 64 



Classification of Recent Aqueous Habitats 65 



Classification of Aqueous Bionomic Realms According to Salinity 66 



Recent Aquatic Faunas 67 



Marine 67 



Fresh Water 69 



Table Showing Number of Genera and Species of Mollusca in Various 



Bionomic Realms 69 



Brackish Water 70 



The Baltic Sea 70 



Comparative Number of Species of Invertebrates in the Baltic, etc. 72 



The Severn Estuary 73 



Summary of Faunal Criteria for Determining the Type of an Aqueous 



Habitat 76 



Application to the Past 77 



Marine Deposits and Faunas 78 



Fluviatile Deposits and Faunas 79 



Brackish Water and Estuarine Deposits and Faunas 83 



The Eurypterid Faunas and their Associated Organisms 84 



Ordovicic 84 



Normanskill Fauna 84 



Schenectady Fauna 84 



