H. 



CONTENTS 



Abstract 



Introduction 



General Discussion . . . 

 Material and Methods 



Page 

 1 

 . 2 

 . 3 

 . 3 



Survey of the Order Peridlniales 4 



General Statements 4 



Families 4 



Genera 5 



State of Knowledge of Morphology 5 



Forms Treated in This Report 6 



Relationships among the Genera 6 



General Considerations 6 



Ventral Area 7 



Girdle 9 



Hypotheca 9 



Epitheca 9 



Summary 9 



Systematic Discussion 11 



Family Peridiniaceae 11 



Genus Peridinium 11 



P. depressum Bailey and Related Forms . 15 



P. depressum 18 



P. depressum var. parallelum 21 



P. depressum var. rectius 22 



P. depressum var. convexius 23 



P. depressum f. bisintercalares .... 23 



P. depressum f. multitabulatum 23 



P. claudlcanoides 24 



P. oceanicum 24 



P. oceanicum var. tenellum 25 



P. oceanicum f. spiniferum 26 



P. oceanicum f. bisintercalares 26 



P. oceanicum f. tricornutum 27 



Page 



P. crassipes 27 



P. truncatum 30 



P. truncatum forma acutum 32 



P. pallidum 32 



Family Ceratocoryaceae 34 



Genus Ceratocorys 34 



Subgenus Euceratocorys 38 



C. horrida 38 



C. armata 40 



C. reticulata 42 



C. aultii 42 



C. bipes 43 



Subgenus Protoceratocorys 43 



C. skogsbergii 44 



C. gourretii 44 



Family Goniodomaceae 45 



Genus Goniodoma 45 



G. polyedricum 46 



Family Gonyaulacaceae 47 



Genus Gonyaulax 47 



G. pacifica 48 



G. fusiformis 50 



Genus Acanthogonyaulax 52 



A. spinifera 53 



Genus Spiraulax 54 



S. kofoidii 55 



Family Ceratiaceae 56 



Genus Ceratium 56 



C. pavillardii 56 



Tables 59 



Bibliography 91 



Figures 95 



Index 129 



vii 



