Helicoprion bessonowi and Xenacanthus decheni

Helicoprion bessonowi, shark-like eugeneodontid holocephalid fish with tooth whorl from the Permian, and prehistoric prickly shark species Xenacanthus decheni of the Devonian and Triassic. Spiralhai, Helicoprion, und Stachelhai, Xenacanthus. Colour printed illustration by F. John from Wilhelm Bolsche's Tiere der Urwelt (Animals of the Prehistoric World), Reichardt Cocoa company, Hamburg, 1908

Animals Of The Prehistoric World Colour-printed Devonian F. John Natural History Permian Prehistoric Animal Riesengursteltier Tiere Der Urwelt Triassic Xenacanthus

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