. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . both phragmocone and body chamber, but thestrength and shape of ribbing changes dramatically on internal moulds at the end of thephragmocone and beginning of the body chamber. This can be clearly seen on theholotype and paratype of N magnificum (Collignon 1969, pi. 523 (fig. 2065); pi. 526(figs 2074-2075)) (Fig. 10A-B); see also Fig. 17). Similar differences in ribbing on thebody chamber and phragmocone on internal moulds have also been recorded inGlyptoxoceras rugatum by Henderson et al. (1992) and may possibly be

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . both phragmocone and body chamber, but thestrength and shape of ribbing changes dramatically on internal moulds at the end of thephragmocone and beginning of the body chamber. This can be clearly seen on theholotype and paratype of N magnificum (Collignon 1969, pi. 523 (fig. 2065); pi. 526(figs 2074-2075)) (Fig. 10A-B); see also Fig. 17). Similar differences in ribbing on thebody chamber and phragmocone on internal moulds have also been recorded inGlyptoxoceras rugatum by Henderson et al. (1992) and may possibly be a diagnosticfeature of some of the genera referred to the subfamily Diplomoceratinae Spath, 1926. The ribbing of Neoglyptoxoceras magnificum is too coarse, and the suture line a littletoo different for it to be considered directly ancestral to D. cylindraceum. The fine ribbingof Neoglyptoxoceras annulatum (Collignon, 1969) (Collignon 1969: 41, pi. 529(figs 2083-2084)) (see also Figs 12-15), however, is perfectly compatible with that of 180 ANNALS OF THE SOUTH AFRICAN MUSEUM. -£,

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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory