. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 147 occur in France and Germany {P. tridorsatum, moureti, and rousseauxi) rep- resent but a single species, a view followed here. P. (P.) lepeei (Fallot, 1885) differs from the present species in having deli- cate dense ribs that lack umbiHcal bullae; it is discussed further below. There are, however, transition forms such as NMB D1145e (Fig. 4) that have a more angular whorl section and weakening ornament on the outer whorl. P. (P.) besairiei van Hoepen, 1965, is
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 147 occur in France and Germany {P. tridorsatum, moureti, and rousseauxi) rep- resent but a single species, a view followed here. P. (P.) lepeei (Fallot, 1885) differs from the present species in having deli- cate dense ribs that lack umbiHcal bullae; it is discussed further below. There are, however, transition forms such as NMB D1145e (Fig. 4) that have a more angular whorl section and weakening ornament on the outer whorl. P. (P.) besairiei van Hoepen, 1965, is based on a depressed variant of this species that is close to the holotype of De Grossouvre's P. (P.) rousseauxi, also regarded as a synonym. Van Hoepen was misled in his interpretation of P. (P.) besairiei by the illustrations of Besairie (1930, pi. 64 (figs 4-6)) and Venzo (1936,. Fig. 9. Peroniceras (Peroniceras) tridorsatum (Schliiter, 1867). SAS Z786, the holotype of Fraudatoroceras besairiei van Hoepen, 1965. x 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 resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
