Journal Article THE EVOLUTION OF AIR‐BREATHING IN PALEOZOIC GNATHOSTOME FISHES Get access Gary C. Packard Gary C. Packard Department of Zoology and Entomology Colorado State University Fort Collins Colorado 80521 Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 28, Issue 2, 1 June 1974, Pages 320–325, https://doi.org/10.1111/j.1558-5646.1974.tb00751.x Published: 01 June 1974 Article history Received: 09 April 1973 Published: 01 June 1974
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