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The end of the vertebral column in fishes exhibits the following 

 chief structural modifications : Unossified, or only partially ossified, 

 and containing no spinal canal, it consists of the chorda alone in 

 (JEsox) : principally of the chorda, surrounded by a more or less 

 complete cartilaginous sheath (Salmo, Alosa, Elops) : of a complete 

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The author points out that Agassiz and Yogt detected the hete- 

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