and through the Paleontological Institute web site:
Members of the Paleontological Society, the Palaeontological Association, and SEPM can access the pdf file for free directly through their respective member web pages.
Desmond T. Donovan and Wolfgang Riegraf. 2016. Part M, Chapter 21: History of the Study of Fossil Coleoidea.
Treatise Online 78:1–17, 3 fig. $11.95.
Jörg Maletz, Alfred C. Lenz and Denis E. Bates. 2016. Part V, Second Revision, Chapter 4: Morphology of the Pterobranch Tubarium. Treatise Online 76:1–63, 44 fig. $49.95.
Viacheslav A. Bizikov and Ronald B. Toll. 2016. Part M, Chapter 9A: The Gladius and its Vestiges in Extant Coleoidea.
Treatise Online 77:1–31, 15 fig. $27.95.