Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 30. Forresteria (Forresteria) alluaudi (Boule. Lemoine & Thevenin, 1907). A pathological body chamber. SAS Z977. xl. 288 ANNALS OF THE SOUTH AFRICAN MUSEUM. B Fig. 31. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). Holotype ofForresteria itwebae van Hoepen, 1968, SAS Z250. xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 289 section. Twelve or thirteen strong, broad, rounded ribs arise at the umbihcalseam. They develop umbihcal bullae of variable strength and pass slightlyprorsiradiate across the
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . B Fig. 30. Forresteria (Forresteria) alluaudi (Boule. Lemoine & Thevenin, 1907). A pathological body chamber. SAS Z977. xl. 288 ANNALS OF THE SOUTH AFRICAN MUSEUM. B Fig. 31. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). Holotype ofForresteria itwebae van Hoepen, 1968, SAS Z250. xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 289 section. Twelve or thirteen strong, broad, rounded ribs arise at the umbihcalseam. They develop umbihcal bullae of variable strength and pass slightlyprorsiradiate across the flanks to massive conical mid-lateral tubercles. Thesegive rise to a pair of straight or feebly concave ribs that link to strong obliqueventral clavi twice as numerous as the lateral tubercles. These in turn give riseto weaker, broad prorsiradiate ribs that form a chevron over the venter with astrong siphonal clavus at the apex of the V. Even at this diameter there is great variation in the relative strengths oftubercles and ribs, the former dominating in SAM-D1187G, the latter inSAM-D1187I. Two slightly larger fragments, SAM-D1187E and F, show essentiallysimilar ornament at estimated diameters of 70 mm; SAM-D1187E () s
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
