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I can learn nothing of the habits of the sharks Hexanchus, Heptanchus, and Echinorhinus, but Müller describes them as possessing a persistent chorda dorsalis. It may be they have the habits of the tope, but other sharks are amongst the very swiftest and most active of fishes. Mr.
Proselachii. : 16. Natidanides. Chlamydoselachius. Heptanchus. Silurian. 17. Ganoides. Plated-fishes. Proganoides. : 17. Accipenserides. Devonian. : 18. Dipneusta. Paladipneusta. : 18. Neodipneusta. Ceratodus. Protopterus. Carboniferous. : 19. Amphibia. Stegocephala. : 19. Phanerobranchia. Salamandrina. Permian. : 20. Reptilia. Proreptilia. : 20. Rhynchocephalia. Primitive lizards. Hatteria.
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