Fig. 63. Prionocyclus macombi Meek, 1876. A, B. lectotype, USNM 20259 in A Revision Of The Turonian Members Of The Ammonite Subfamily Collignoniceratinae From The United States Western Interior And Gulf Coast

Fig. 63. Prionocyclus macombi Meek, 1876. A, B. lectotype, USNM 20259, from the Juana Lopez Member of the Carlile Shale in Colfax County, New Mexico. C–G. USNM 22940, the originals of Stanton, 1894, plate 41, figures 1–3, from ''near Mancos, southwestern Colorado, about 400 feet above the base of the Colorado Cretaceous shales, where it is associated with Ostrea lugubris and Inoceramus dimidius.'' Figures A–C, E–G are X1; figure D is X2.