. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . s ornament and coiling is concerned, plusthe effects of probable dimorphism. A comparable wide range of variation was shown inDidymoceras awajiense (Yabe) by Morozumi (1985: 35, pi. 10 (figs 1-4), pi. 11 (fig. 1),pi. 12 (figs 1-2), pi. 13 (figs 1-2), pi. 14 (figs 1-2), pi. 15 (figs 1-3), text-figs 9-11) fromthe upper Campanian of Awaji Island, Japan. This includes specimens with a nearlyplanispiral phragmocone (Morozumi 1985, pi. 10 (fig. 4)), to specimens with a highturreted spire (Morozumi 1985 pi. 13 (fig. 2), pi
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . s ornament and coiling is concerned, plusthe effects of probable dimorphism. A comparable wide range of variation was shown inDidymoceras awajiense (Yabe) by Morozumi (1985: 35, pi. 10 (figs 1-4), pi. 11 (fig. 1),pi. 12 (figs 1-2), pi. 13 (figs 1-2), pi. 14 (figs 1-2), pi. 15 (figs 1-3), text-figs 9-11) fromthe upper Campanian of Awaji Island, Japan. This includes specimens with a nearlyplanispiral phragmocone (Morozumi 1985, pi. 10 (fig. 4)), to specimens with a highturreted spire (Morozumi 1985 pi. 13 (fig. 2), pi. 14 (fig. 1)). Apart from being older(Campanian), D. awajiense has different ornament—on the body chamber virtually everyrib is bituberculate—in contrast to the irregular tuberculation in N. (B.) account of the regular coiling of the early whorls, we suggest that D. awajiense shouldalso be referred to the subgenus N. (Bostrychoceras). Nostoceras (N) fischeri (Brunnschweiler, 1966) (in Henderson et al. 1992: 136, 260 ANNALS OF THE SOUTH AFRICAN MUSEUM. <
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