. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 62 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. II Suture-line, slightly eroded, of Euomphaloceras cunningtoni meridionale (Pervinquiere), SAM K2552. X 1. lateral tubercles. Both these varieties are well treated by Kennedy (1971). The holotype is from the top of the Turrilites costatus faunal assemblage of Wiltshire. Aptychus sp. Description A single small Aptychus was collected at Novo Redondo in association with indeterminate acanthocerate fragments, Turrilites costatus and Anisoceras plicatile, and is
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 62 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. II Suture-line, slightly eroded, of Euomphaloceras cunningtoni meridionale (Pervinquiere), SAM K2552. X 1. lateral tubercles. Both these varieties are well treated by Kennedy (1971). The holotype is from the top of the Turrilites costatus faunal assemblage of Wiltshire. Aptychus sp. Description A single small Aptychus was collected at Novo Redondo in association with indeterminate acanthocerate fragments, Turrilites costatus and Anisoceras plicatile, and is consequently of low Middle Cenomanian age. The specimen is preserved as an internal mould, and has a strongly trigonal shape. The inner margin was broken during extraction, but it formed almost a right angle with the harmonic margin. The surface of the mould, the inner surface of the Aptychus, is ornamented with very fine, concentric striae which fade away on the adharmonic ridge. Discussion The specimen seems closest to Spinaptychus Trauth, but the latter is known only from Senonian beds, commonly in association with Texanites (Klinger I971)- Consequently its generic assignation is uncertain. Age of the Fauna The most detailed biostratigraphic subdivision of the Cenomanian is that of Kennedy (1971) for southern England. This author has recognized 5 biostratigraphic zones: Upper Cenomanian: Metoicoceras gourdoni Zone Metoicoceras geslinianum Zone Calycoceras naviculare Zone. 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
