Fig. 113 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America

Fig. 113. Plot of the ratio of whorl width to whorl height (W/H) versus shell diameter (mm) in Hoploscaphites brevis (Meek, 1876) in early (top graph) and later ontogeny (bottom graph; see figs. 110– 112 for illustrations of cross sections on which these graphs are based, and appendix 2, tables 4–6, for a list of measurements). The ratio decreases through most of ontogeny until the beginning of the mature phragmocone, after which it sometimes increases. Filled symbols indicate measurements in the mature body chamber.