Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . >.o o ^E X 1 IT) < N H X(u N .Sc/5 J 00-OS ^ ,-( ll •-. o 278 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 24. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). A-B. SAS Z949. C-D. SASH196/2. All xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 279 F. (F.) alluaudi in developing massive pinched lateral horns that bear loopedribs connecting to ventral clavi and lacks an umbilical bulla (whether thelateral horn develops from the fusion of an umbilical bulla and lateral tubercleon the inner whorls or represe
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Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . >.o o ^E X 1 IT) < N H X(u N .Sc/5 J 00-OS ^ , -( ll •-. o 278 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 24. Forresteria (Forresteria) alluaudi (Boule, Lemoine & Thevenin, 1907). A-B. SAS Z949. C-D. SASH196/2. All xl. CRETACEOUS FAUNAS FROM SOUTH AFRICA 279 F. (F.) alluaudi in developing massive pinched lateral horns that bear loopedribs connecting to ventral clavi and lacks an umbilical bulla (whether thelateral horn develops from the fusion of an umbilical bulla and lateral tubercleon the inner whorls or represents merely the outward migration and accentua-tion of the umbihcal bulla above is not clear, due to artificial carving of ribson the inner whorl of the type specimen). F. serrata Reyment (1955: 69, pi.15 fig. 3a-b)), from the Coniacian Awgu-Ndeaboh Shales near Enugu, Nigeria, is known from the holotype only, a juvenile 36, 5 mm in diameter.The flanks are flattened and subparallel, with a rounded fastigiate venter.Weak umbilical bullae give rise to narrow primary ribs that develop into abullate tubercle on the ventrolateral shoulder, where they are joined by oneor two non-