IV 
ERIK A : SON STENSIO 
pagina 
Genus Birgeria Stensio .150 
Birgeria mougeoti (Agassiz) ..... 151 
Birgeria sp. 199 
Genus Glaucolepis n. g.200 
Glaucolepis gyrolepidoides n. sp.201 
Genus Pygopterus Agassiz.203 
Pygopterus de geeri n. sp.203 
Genus Boreosomus n. g.210 
Boreosomus arcticus A. S. Woodward . 211 
Boreosomus reuterskioldi n. sp.215 
Boreosomus sp.219 
Boreosomus? scaber n. sp. ...... 221 
Genus Acrorhabdus n. g.222 
Acrorhabdus bertili n. sp.223 
Acrorhabdus asplundi n. sp.233 
Acrorhabdus latistriatus n. sp.235 
The organization of Palaeoniscids. Sum- 
238 
pagina 
Family Platysomidae. 
General remarks.250 
Genus Platysomus Agassiz .251 
Platysomus nathorsti n. sp.251 
Platysomus sp.252 
Family Catopteridae. 
Historical remarks.253 
The geological occurence and geographical 
distribution of the Catopterids .... 255 
Genus Perleidus de At.essandri.255 
Perleidus woodwardi nom. nov.257 
Some remarks on the genera Catopterus, 
Dictyopyge, Colobodus s. str., Perleidus, 
Dollopterus and Meridensia .267 
Some observations on the family Cato¬ 
pteridae. A summary.269 
Palaeoniscids, Platysomids and Catopterids 
compared with recent Ganoids and Teleosts 271 
mar} - 
