36 The Ganoids 
Woodward unites the extinct genera called Cyclurus, Noteus, 
Amiopsis, Protamia, Hypamia, and Pappichthys with Amuza. 
Pappichthys (corsont, etc.), from the Wyoming Eocene, is doubt- 
less a valid genus, having but one row of teeth in each jaw, and 
Amiopsis is also recognized by Hay. Woodward refers to 
Ama the following extinct species: Amza valenciennesi, from 
the Miocene of France; Amia macrocephala, from the Miocene 
of Bohemia; and Amza ignota, from the Eocene of Paris. Other 
species of Amia are known from fragments. Several of these 
are from the Eocene of Wyoming and Colorado. Some of 
them have a much shorter dorsal fin than that of Amza calva 
and may be generically different. 
The genus Megalurus differs from Amza in the still shorter 
dorsal fin, less than one-third the length of the back. The 
body is elongate and much depressed. Megalurus lepidotus 
Fic. 26.—Megalurus elegantissimus Wagner. Family Amiide. (After Zittel.) 
and several other species are found in the lithographic stones 
of Bavaria and elsewhere. 
The Oligopleuride.— In the extinct family Oligopleuride 
the scales are cycloid, the bones of the head scarcely enameled, 
and the vertebra well ossified. Fulcra are present, and the 
mouth is large, with small teeth. The genera are Oligopleurus, 
Ionoscopus, and Spathiurus, the species not very numerous 
and chiefly of the Cretaceous. Ionoscopus cyprinoides of the 
lithographic shales of Bavaria is a characteristic species. 
From the three families last named, with the Pholidophoride, 
there is an almost perfect transition from the Ganoid fishes to 
teleosteans of the order of Isospondyli, the primitive order from 
which all other bony fishes are perhaps descended. The family 
of Leptolepide, differing from Oligopleuride in the absence of 
fulcra, is here placed with the Jsospondyli, but it might about 
as well be regarded as Ganoid. 
