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Fig.27 Young Apeltes one week old, with the lower lobe of the caudal developing and becoming heterocercal; Fig.28 Recently hatched embryo of Esox reticulatus, showing the wide median finfolds, the distribution of vitelline vessels, and the course of the caudal and subintestinal veins; Fig.29 A much older stage of Esox reticulatus, in which the flat snout is becoming apparent and the rudiments of the caudal, anal, and dorsal fins are becoming evident

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