Fig. 74 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America

Fig. 74. Plot of the ratio of whorl width to height (W/H) versus shell diameter (mm) in Hoploscaphites nodosus (Owen, 1852) in early (top graph) and later ontogeny (bottom graph; see figs. 72, 73 for illustrations of cross sections on which these graphs are based, and appendix 2, tables 1–3, for a list of measurements). The ratio of whorl width to height decreases through most of ontogeny until the beginning of the mature phragmocone, after which it increases. Filled symbols indicate measurements in the mature body chamber.