The Primitive Fishes 



279 



Chomatodiis of four species, Ctenoptychius {Harpacodus) 

 dentatiis and others are, like not a few fish of the present 

 day, anadromous in habit. Accordingly, in the writer's 

 subjoined classification of Young's list, he has not only 

 given the marine fishes that were derived from freshwater 

 ancestry, and those — wholly absent from Davis' list — that 

 remained freshwater, he has also indicated by the prefix 

 an the types that were evidently anadromous, and so are 

 often included in both lists. 



LIST OF FISHES FROM YOUNG'S "CATALOGUE OF THE 

 WESTERN SCOTTISH FOSSILS." 



Arranged According to Natural Habitat. 



The prefix an indicates that the species seems to have been 

 anadromous in habitat. 



Freshwater. 



(i) Elasmobranchii (2) 



an Chomatodus cinctus 

 an Chomatodus clavatus 

 an Chomatodus linearis 

 an Chomatodus obliquus 

 an Cladodus conicus 

 an Cladodus laevis 



Cladodus parvus 

 an Ctenacanthus brevis 



Ctenacanthus hybodoides 

 an Ctenacanthus major 

 an Ctenacanthus tenuistriatus 



Ctenoptychius (Petalodus) 

 apical is 

 an Ctenoptychius dentatus 



Ctenoptychius pectinatus 



Diplodus (Pleuracanthus) 

 gibbosus 



Gyracanthus formosus 

 an Hclodus laevissimus 



Helodus simplex 

 an Leptacanthus jenkinsoni 

 an Leptacanthus junceus 



Orthacanthus cylindricus 



Pleurodus affinis 



Pleurodus rankinei 



Petalodus apicalis 



Tristychius arcuatus 



Acanthodes sulcatus (3' 



Acanthodes ivardi 



Poecilodus angustus 

 an Poecilodus obliquus 



Janassa imbricata 



Ganoidei 



Acrolepis sp. 



Amphicentrum granulosum 

 Asterolepis sp. 

 Coelacanthus lepturus 

 Cycloptychius sp. 

 Dendroptychius sp. 

 Eurynotus crenatus 

 Gyrolepis rankinei 

 Megalichthys ? coccolepis 

 Megalichthys hibberti 

 Megalichthys ? rugosus 

 Mesolepis sp. 

 Palaeoniscus dwvernoyi 

 Palaeoniscus egertoni 

 Palaeoniscus monensis 

 Palaeoniscus ornatissimus 

 Palaeoniscus robisoni 

 Palaeoniscus striolatus 

 Palaeoniscus ivardi 

 Platysomus declivus 

 Platysomus parvulus 

 Pygopterus sp. 

 Rhizodopsis granulatus 

 Rhizodus hibberti 

 Rhizodus portlocki 

 Strepsodus sauroides 



Dipnoi 



Ctenodus cristatus 

 Ctenodus imbricatus 

 Ctenodus tuberculatus 

 Uronemus magnus 



