CONTENTS 



PAGE 



Preface 9 



Geological introduction 12 



Descriptions of genera and species 31 



Lingula 33 



Glossina 37 



Orbiculoidea 39 



Crania 43 



Leptaena 48 



Schuchertella 53 



Schellwienella 59 



Streptorhynchus 68 



Orthotetes 74 



Chonetes 78 



Chonopectus 95 



Productella 97 



Productus 103 



Diaphragmus 135 



Echinoconchus 138 



Strophalosia 143 



Rhipidomella 147 



Schizophoria 161 



Camarophoria 169 



Camarotoechia 175 



Liorhynchus 185 



Paryphorhynchus 187 



Pugnoides 192 



Allorhynchus 197 



Pugnax 202 



Rhynchotetra 205 



Tetracamera 212 



Shumardella 221 



Rhynchopora 227 



Centronella 241 



Selenella 243 



Trigeria 245 



Centronelloidea 246 



Cranaena 248 



Dielasmoides 253 



Dielasma 256 



Girtyella 271 



Dielasmella . 279 



