CONTENTS 



Page 



Introduction o . 7 



Acknowledgments . 7 



Preparation and illustration . . . • . . . 8 



Taxonomic procedure . . . . . 8 



Stratigraphic summary 9 



Locality list 11 



Check list 14 



Terminology . . . ■ . .".-..■.". 15 



Glossary 15 



Plate 1 . 23 



Plate 2 25 



Bibliography . . . , . . 26 



Systematics 29 



Family Paleocyclidae 29 



Genus Microcyclus Meek and Worthen 29 



Microcydus blairi Miller 29 



Family Cyathaxonidae . 29 



Genus Cyathaxonia Michelin 29 



Cyathaxonia tantilla (Miller) emend . 30 



Family Metriophyllidae . . . . . . . 31 



Genus Metriophyllum Milne-Edwards and Haime 31 



Metriophyllum deminuthmm n. sp 31 



Genus Rotiphyllum Hudson .-..•. 32 



Rotiphyllum calyculum (Miller) emend .32 



Rotiphyllum hians n. sp . . . . 33 



Family Streptelasmidae . . . . . . - . - . 34 



Genus Pseudocryptophyllum n. gen 34 



Pseudocryptophyllum cavum n. sp. . . . • 34 



Family Hapsiphyllidae Grabau emend 34 



Genus Triplophyllites n, gen. .,.....,...,......,..,... . . . . . 35 



Triplophyllites palmaUu n. sp 35 



Triplophyllum terebratum (Hall) 38 



Triplophyllites centralis (Milne-Edwards and Haime) 39 



Triplophyllites cliff ordanus (Milne-Edwards and Haime) 39 



Triplophyllites exigiius (Miller) . .... . . 40 



Triplophyllites ida (Winchell) emend. . . . " 41 



Genus Hapsiphylliim Simpson emend. 42 



Subgenus HapsipJiyllum Simpson emend. . . . . . . , ■ 42 



Subgenus Homalophyllites n. subgen. 42 



Hapsiphyllum {Homalophyllites) calceolus (White and Whitfield) 43 



Hapsiphyllum {Homalophyllites) pifinatus n. sp. . 44 



Genus Neozaphrentis Grove 44 



Neozaphrentis tenella (Miller) emend 45 



Genus Meniscophyllum Simpson emend. . ... . . ' , .45 



Meniscophylhim minutiim Simpson 46 



