CONTENTS. 
pagina 
INTRODUCTION. V 
Some remarks on the geology of 
the Triassic of Spitzbergen. 
Historical .. IX 
Observations made by the author.XV 
Composition, stratigraphical distribution and 
relation of the vertebrate fauna . . . XXIII 
Description of the fish fauna. 
Elasmobranchii. 
Family Cestracionidae. 
Genus Hybodus Agassiz . i 
Hybodus rapax n. sp. .. 3 
Hybodus sasseniensis n. sp. 5 
Hybodus microdus n. sp. 8 
Genus Acrodus Agassiz. 8 
Acrodus spitqbergensis Hui.ke ..... 10 
Acrodus vermiformis n. sp. ..... . 18 
Acrodus scaber n. sp.20 
Acrodus oppenheimeri n. sp.21 
Cephalic spines, fin-spines and dermal 
denticles belonging to Hybodus, Acrodus 
or closely related genera.25 
Genus Poly acrodus Jaekel. 27 
Polyacrodus pyramidalis n. sp. .... 29 
Polyacrodus angulatus n. sp.3i 
Genus Palaeobates H. v. Meyer. 33 
Palaeobates polaris n. sp. . ..34 
Palaeobates n. sp. 3g 
Generically indeterminable fin-spines of 
Cestracionids. 40 
Teleostomi. 
Order Dipnoi. 
Genus Ceratodus Agassiz 
Ceratodus sp.42 
pagina 
Order Crossopterygii. 
Family Coelacanthidae. 
Historical.43 
The geological range and geographical 
distribution of Coelacanthids.49 
Genus Wimania n. g.51 
Wimania sinuosa n. sp.53 
Wimania? sp. 79 
Wimania? multistriata n. sp.81 
Genus Sassenia n. g.84 
Sassenia tuberculata n. sp.85 
Sassenia guttata (A. S. Wooodward) . . 88 
Genus Axelia n. g.89 
Axelia robusta n. sp.90 
Axelia elegans n. sp.106 
Genus Mylacanthus n. g.107 
Mylacanthus lobatus n. sp.108 
Mylacanthus spinosus n. sp.no 
Genus Scleracanthus n. g.in 
Scleracanthus asper n. sp.in 
Mylacanthus? or Scleracanthus? sp. . . 114 
Some remarks on preveously described 
Coelacanthids.115 
The Organization of Coelacanthids. Sum¬ 
mary .120 
Coelacanthids compared with a number 
of other fishes and certain tetrapods i3i 
Concluding remarks on the systematic po¬ 
sition of the Coelacanthids.147 
Order Actinopterygii. 
Family Palaeoniscidae. 
Historical remarks.148 
Some remarks on the geological appe¬ 
arance and the geographical distribution 
of the Palaeoniscids with special refe¬ 
rence to the Triassic forms.148 
