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This lamprey eel has a row of holes on its neck; these are openings that lead to its lungs; there are seven on each side, (Hooker, 1886).
KeywordsCyclostomata, lamprey, hagfish, jawless fish, kkeels
Worthington Hooker, The Child's Book of Nature (New York:Harper & Brothers, Franklin Square, 1886) 31 ( in back of book)
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