《ON THE MIDDLE & UPPER ORDOVICIAN FAUNAS OF NORTHERN GREENLAND》

Preface5

Historical remarks6

Scandinavian researches into the European Arctic region6

Early English expeditions into the American Arctic region7

The“Fram”and the“Gj?a”Expeditions8

American expeditions in the Arctic archipelago10

The geological conditions in the vicinity of Cape Calhoun11

The fauna:12

Cephalopoda:12

Order Nautiloidea12

On the classification of the Nautiloidea14

Description of genera and species24

Suborder Holochoanites24

Family Endoceratidae24

Genus Vaginoceras25

Endoceras27

Protocycloceras31

Narthecoceras32

Suborder Orthochoanites34

Family Orthoceratidae34

Genus Ephippiorthoceras34

Family Cycloceratidae35

Genus Dawsonoceras35

Spyroceras37

Family Apsidoceratidae37

Genus Apsidoceras38

Charactoceras39

Family Tarphyceratidae41

Genus Plectoceras41

Family Eudoceratidae43

Genus Tripteroceras43

Lambeoceras44

Suborder Cyrtochoanites50

Family Actinoceratidae51

Genus Actinoceras53

Leurorthoceras58

Armenoceras60

Huronia63

Kochoceras65

Calhounoceras77

Family Sactoceratidae79

Genus Sactoceras79

Eskimoceras81

Family Gonioceratidae82

Genus Gonioceras82

Family Oncoceratidae90

Genus Westenoceras90

Maelonoceras91

Thuleoceras93

Family Phragmoceratidae95

Genus Cyrtogomphoceras96

Diestoceras99

Aberrant genus: Danoceras101

Some Baltic Ordovician cephalopods103

Genus Ormoceras104

Actinoceras106

Subgenus Nybyoceras106

Genus Megadiscosorus107

Cyrtogomphoceras108

Preliminary remarks on the stratigraphy and paleogeography109

The local succession of faunal zones110

Synopsis of species,showing their vertical distribution113

Stratigraphical table115

Facies116

Correlation with other Arctic localities117

On the distribution of the Arctic Ordovician cephalopods outside of the Arctic basin117

Some general statements on the distribution of the fauna and its bearing on paleogeography118

Literature121

Explanation of Plates125