living fossil

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Across
  1. 4. subclass of the coelacanth
  2. 6. the organ unique to the coelacanth
  3. 7. where the author obtained his phd
Down
  1. 1. the scientist who first discovered the fish
  2. 2. the islands where the second coelacanth was found
  3. 3. the fish at hand
  4. 5. the African ichthyologist