CONTENTS 



PAGE 



Hamburgia 282 



Atrypa 284 



Cyrtina 286 



Spirif erina 291 



Delthyris 300 



Spirifer 307 



Brachythyris 370 



Cyrtia 382 



Syringothyrjs 384 



Pseudo syrinx 404 



Spiriferella 412 



Acanthospira 418 



Martinia 420 



Ambocoelia 423 



Reticularia 427 



Ptychospira 435 



Eumetria '. 437 



Acambona 448 



Hustedia 451 



Nucleospira 453 



Camarophorella 458 



Rowleyella 462 



Athyris 464 



Cliothyridina 472 



Composita 484 



