The history of the tortoise

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Across
  1. 1. Overlap
  2. 5. Reproduction
  3. 7. Thoroughgoing
  4. 9. Dugong
  5. 10. Streamlined
  6. 11. Smt leave me in little doubt
  7. 12. Smt leave me in no doubt
  8. 17. Imcarnation
  9. 18. Cease
  10. 21. Fin
  11. 22. Returnee
  12. 23. Crab
  13. 24. Seal
  14. 26. Vertebrate
  15. 27. Contemporary
  16. 28. Constitute
  17. 29. Revert to smt
Down
  1. 2. Modem
  2. 3. Ambitious
  3. 4. Manatee
  4. 6. Primeval
  5. 8. Centipede
  6. 13. In one respect
  7. 14. Remote
  8. 15. Gill
  9. 16. Ashore
  10. 19. Crustacean
  11. 20. Enterprising
  12. 25. Parched