FIG. 13 in A new species of Hoploscaphites (Ammonoidea: Ancyloceratina) from cold methane seeps in the Upper Cretaceous of the U.S. Western Interior

FIG. 13. Jaws and hooklike structures attributed to Hoploscaphites gilberti, n. sp., or an as yet undescribed, more coarsely ornamented species of Hoploscaphites, Pierre Shale, South Dakota. A. Lower jaw showing the midline slit, ventral view, apex on top, AMNH 64532, Baculites scotti Zone, Pierre Shale, AMNH loc. 3386, Butte County, South Dakota. B. Upper jaw, apex on top, AMNH 64547, Baculites scotti Zone, Pierre Shale, AMNH loc. 3386, Butte County, South Dakota. C. Hooklike structure showing one of the points projecting to the upper right, AMNH 63530, Didymoceras nebrascense Zone, Pierre Shale, AMNH loc. 3440, Butte County, South Dakota. D. Hooklike structure with the basal portion exposed on the bottom, AMNH 63531, Didymoceras nebrascense Zone, Pierre Shale, AMNH loc. 3340, Fall River County, South Dakota. E. Hooklike structure with one point complete and one point broken, AMNH 64533, Didymoceras nebrascense Zone, Pierre Shale, AMNH loc. 3340, Fall River County, South Dakota.