. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. REVISION OF LATE VALANGINIAN CEPHALOPODA 155 The abbreviations for measurements given in the text are explained in Figure 2 where D = diameter, H = height, Uo = outer umbilical diameter (between umbilical bullae), Ui = inner umbilical diameter (between umbilical seams), Wi = intercostal width. All measurements are given in millimetres, and dimensions, as a percentage of the diameter, are included in parentheses. Class Cephalopoda Cuvier, 1797 Subclass ammonoidea Zittel, 1884 Order PHYLLOCERATIDA Arke
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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. REVISION OF LATE VALANGINIAN CEPHALOPODA 155 The abbreviations for measurements given in the text are explained in Figure 2 where D = diameter, H = height, Uo = outer umbilical diameter (between umbilical bullae), Ui = inner umbilical diameter (between umbilical seams), Wi = intercostal width. All measurements are given in millimetres, and dimensions, as a percentage of the diameter, are included in parentheses. Class Cephalopoda Cuvier, 1797 Subclass ammonoidea Zittel, 1884 Order PHYLLOCERATIDA Arkell, 1950 Superfamily phyllocerataceae Zittel, 1884 Family Phylloceratidae Zittel, 1884 Subfamily Phylloceratinae Zittel, 1884 Genus Partschiceras Fucini, 1920 Type species Ammonites partschi Stur, 1851 {non Klipstein 1843); by original designation of Fucini, 1920 Discussion This is a long-ranging genus, having been recorded from Lower Jurassic (Sinemurian) to Upper Cretaceous (Maastrichtian). It differs from Phylloceras in being more inflated with maximum width at mid-flank, and in commonly developing ribs as well as lirae in maturity. Moreover, Phylloceras has triphyllic saddles not diphyllic as in Partschiceras. Wiedmann (1962 has recently included Phyllopachyceras Spath as a junior synonym in this genus. Partschiceras rogersi (Kitchin, 1908) Fig. 3 Phylloceras rogersi Kitchin, 1908: 179, pi. 8 (fig. 19, 19a-c). Spath, 1930: 140. Du Toit, 1954: 384. Haughton, 1963: 274. Non Phylloceras rogersi Kitchin var. nov., Krenkel, 1910: 223, pi. 22 (fig. 9) ( = P. krenkeli Zwierzycki). Phyllopachyceras rogersi (Kitchin) Collignon, 1962: 20, pi. 181 (figs 815-816). Material The holotype is the only example so far collected from the Sundays River Formation and its present whereabouts is unknown.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly re