The Paleontological Institute is pleased to announce the publication of a new article in Treatise Online. It is available at https://journals.ku.edu/index.php/treatiseonline, and through the Paleontological Institute web site: http://paleo.ku.edu. Members of the Paleontological Society, the Palaeontological Association, and SEPM can access the pdf file for free directly through their respective member web pages.
Michael K. Howarth. 2017. Part L, Revised, Volume 3B, Chapter 6: Systematic Descriptions of the Stephanoceratoidea and Spiroceratoidea. Treatise Online 84:1–101, 66 fig., 1 table, $49.95.
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