Rigby, J. Keith, Mark G. McKinzie, and Brooks B. Britt. 2008. Pennsylvanian sponges from the Graford Formation, Wise County, Texas. Journal of Paleontology, 82(3):492.

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In this article, errors occur in the second column of page 492. In the discussion of the Perrin Delta system, the author of work on that system, Petty (1975) is misspelled as Perry in two instances. Perry should be read as Petty.

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