Fishes . e scales are rhombic,but are sometimes wanting, at least on the tail. Many generaand species of Pycnodontidce are described, mostly from Triassicand Jurassic rocks of Europe. Leading European genera arePycnodus, Typodus (Mesodon), Gyrodus, and Palccobalistiim. Thenumerous American species belong to Typodus, Coclodiis,Pycnodus, Hadrodus, and Uranoplosus. These forms have noaffinity with Balistes, although there is some resemblance inappearance, which has suggested the name of Palccohalistum. The Ganoids 259 Woodward places these fishes with the Semionotidcc and Ha-lecouwrphi in his sub
Fishes . e scales are rhombic,but are sometimes wanting, at least on the tail. Many generaand species of Pycnodontidce are described, mostly from Triassicand Jurassic rocks of Europe. Leading European genera arePycnodus, Typodus (Mesodon), Gyrodus, and Palccobalistiim. Thenumerous American species belong to Typodus, Coclodiis,Pycnodus, Hadrodus, and Uranoplosus. These forms have noaffinity with Balistes, although there is some resemblance inappearance, which has suggested the name of Palccohalistum. The Ganoids 259 Woodward places these fishes with the Semionotidcc and Ha-lecouwrphi in his suborder of Protospondyli. It seems preferable,however, to consider them as forming a distinct order. Order Lepidcstei.—We may place, following Eastmans editionof Zittel, the allies and predecessors of the garpike in a singleorder, for which Huxleys name Lepidostei may well be this group the notochord is persistent, and the vertebras arein various degrees of ossification and of different forms. The.
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