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Summary

Description Fig. 137.—Platysomus gibbosus, a "heterocercal" Ganoid, from the Middle Permian of Russia. Sharks. Not only are the Ganoids still the predominant group of Fishes, but all the known forms possess the unsymmetrical ("heterocercal") tail which is so characteristic of the Palæozoic Ganoids. Most of the remains of the Permian Fishes have been obtained from the "Marl-slate" of Durham and the corresponding "Kupfer-schiefer" of Germany, on the horizon of the Middle Permian; and the principal genera of the Ganoids are Palœoniscus and Platysomus (fig. 137).
Date
Source http://www.gutenberg.org/files/14279/14279-h/14279-h.htm
Author H. ALLEYNE NICHOLSON

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2 October 1876Gregorian

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Date/TimeThumbnailDimensionsUserComment
current10:05, 2 August 2008Thumbnail for version as of 10:05, 2 August 2008367 × 250 (46 KB)FunkMonk{{Information |Description= |Source= |Date= |Author= |Permission= |other_versions= }}
16:35, 30 July 2008Thumbnail for version as of 16:35, 30 July 2008367 × 250 (23 KB)FunkMonk== Summary == {{Information |Description=Fig. 137.—Platysomus gibbosus, a "heterocercal" Ganoid, from the Middle Permian of Russia. Sharks. Not only are the Ganoids still the predominant group of Fishes, but all the known forms possess the unsymmetrical

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