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A Guide to the Study of Fishes, Volume 1 (of 2) Chapter 29 THE CLASS ELASMOBRANCHII OR SHARK-LIKE FISHES 
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A Guide to the Study of Fishes, Volume 1 (of 2) Chapter 29 THE CLASS ELASMOBRANCHII OR SHARK-LIKE FISHES Chapter 29 THE CLASS ELASMOBRANCHII OR SHARK-LIKE FISHES
The Sharks.-The gap between the lancelets and the lampreys is a very wide one. Assuming the primitive nature of both groups, this gap must represent the period necessary for the evolution of brain, skull, and elaborate sense organs. The interspace between the lampreys and the nearest fish-like forms which follow them in an ascending scale is not le
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