Archive image from page 53 of Devonian fishes of Iowa (1908). Devonian fishes of Iowa . devonianfishesof00east Year: 1908 60 IOWA GEOLOGICAL SURVEY along the entire length of the abdomen. Therefore, if the sep- arate median fins were produced by the subdivision of a primi- tively continuous median membrane along the back and the lower side of the tail, the paired fins arose similarly by the sub- division of continuous membranes which extended as a sym- metrical pair along the outside walls of the body-cavity.

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