《on the genus cycloclypeus carpenter part 1》

Preface7

Chapter Ⅰ.Geographical and stratigraphical distribution of the genus Cycloclypeus9

Geographical distribution9

Stratigraphical distribution9

Chapter Ⅱ.The morphology and anatomy of the shell of Cycloclypeus.13

Historical review13

The anatomy of the shell of the cycloclypei15

Definition of the genus Cycloclypeus15

The sculpture p15

General aspect of the equatorial layer of chambers of megalospheric froms16

The protoconch17

The nepionic stage18

The neanic stage22

The vertical section of the genus Cycloclypeus24

The microspheric generation of the cycloclypei25

The distinction of the megalospheric from the microspheric generation in horizontal section28

Chapter Ⅲ.Remarks on the ontogeny of the cycloclypei.30

Chapter Ⅳ.Glossary of anatomical terms used.31

Chapter Ⅴ.The taxonomy of the cycloclypei.33

On the question whether the cycloclypei are to be considered as Camerinidae or as Orbitoididae?33

Is the genus Cycloclypeus an artificial group?34

The taxonomical value of some features of the cycloclypei35

Our classification of the cycloclypei37

Chapter Ⅵ.Methods of slicing and examination.38

Chapter Ⅶ. Descriptions.39

Synopsis of the larger systematical categories39

Subgenus Cycloclypeus40

Cycl. koolhoveni41

Cycl. oppenoorthi43

Cycl. eidae50

Cycl. posteidae59

Subsectio of Cycl. carpenteri63

Cycl. indopacificus var. typica, Cycl. postindopacificus var. postindopacifica66

Cycl. indopacificus var. vandervlerki67

Cycl. indopacificus var. douvillei,Cycl. postindopacificus var. postdouvillei68

Cycl. indopacificus var. terhaari,Cycl. postindopacifieus var. postterhaari71

Cycl. postindopacificus var. tenuitesta,Cycl. cf. carpenteri73

Cycl. cf. carpenteri75

Remarks on Cycl. communis Martin82

Remarks on Cycl. communis var. borneensis Rutten83

Remarks on Cycl. pustulosus Chapman84

Subsectio of Cycl. guembelianus84

Cycl. inornatus var. typica85

Cycl. inornatus var. tenuis87

Cycl. postinornatus, Cycl. cf. guembelianus89

Cycl. cf. guembelianus90

Remarks on Cycl. neglectus Martin91

Subgenus Radiocycloclypeus92

Cycl. (Radio-cycl.) stellatus92

Cycl. (Radiocycl.) radiatus94

Chapter Ⅷ. Results of the investigation of the cycloclypei95

Introduction95

The evolution of some features of the subgenera Cycloclypeus and Radiocycloclypeus98

The evolution in the megalospheric generation98

The nepionic apparatus of the subgenus Cyclocly-peus98

The nepionic apparatus of the subgenus Radiocycloclypeus102

The sculptural evolution of the subgenus Cycloclypeus102

The sculptural evolution of the subgenus Radiocycloclypeus106

The evolution of the size of the megalospheric generation of the subgenus Cycloclypeus106

The evolution of some features of the microspheric generation of the subgenus Cycloclypeus107

The ancestors of the cycloclypei108

Chapter Ⅸ.General remarks on the results.110

On the autonomy of evolution110

The interindependency of the evolution of the features of the same form111

The principle of coexistence or overlap113

The discontinuity of evolution114

On lines of descent115

On heterolineages117

On homologous lineages121

Crosses of specialization with the subgenus Cycloclypeus123

The system of the cycloclypei124

Chapter Ⅹ.Stratigraphical results.127

The stratigraphical subdivision of the biozone of the subgenus Cycloclypeus127

The subdivision based on the nepionic bioseries127

The thickness of the strata representing an aurora128

Remarks on the above time division128

The subdivision based on the sculptural mutants129

The subdivision based on the microspheric generation129

The coordination of the nepionic aurorae with the subdivisions of the international stratigraphical scale129

Remarks on the biostratigra-phical method131

Remarks on Buckman's method131

Appendix.On the heterostegines of Tjimanggoe. S. Bantam, Java.133

Bibliography.138

Plates.143

List of tables194