. Bulletin of the British Museum (Natural History), Geology. U, U,. Fig. 1 Sutures of Gaudryceras varicostatum van Hoepen. TM 538, x 7£ approx. typical Gaudryceras-Yike subsequent ornament, which place it clearly within the group of G. mite. There are obvious comparisons with Gaudryceras stefaninii, from which this species may well be descended, but there are more constrictions and a completely different whorl section in that species. Similar features separate G. varicostatum from Gaudryceras varagurense, as does the pre- sence of more constrictions (six to eight per whorl), more evolute coili
. Bulletin of the British Museum (Natural History), Geology. U, U,. Fig. 1 Sutures of Gaudryceras varicostatum van Hoepen. TM 538, x 7£ approx. typical Gaudryceras-Yike subsequent ornament, which place it clearly within the group of G. mite. There are obvious comparisons with Gaudryceras stefaninii, from which this species may well be descended, but there are more constrictions and a completely different whorl section in that species. Similar features separate G. varicostatum from Gaudryceras varagurense, as does the pre- sence of more constrictions (six to eight per whorl), more evolute coiling and finer lirae in the latter. Differing relative proportions and coarseness of ornament also allow separation of medium- sized specimens from the superficially similar Gaudryceras beantalyense and G. analabense. Gaudryceras striatum Jimbo (1894: pi. 6, fig. 6) and var. pictum Yabe (1903: 33; pi. 4, fig. 6) are very finely ribbed and have many more collars and constrictions per whorl. The poorly-known Gaudryceras propemite is said to have depressed whorls up to diameters of Plate 4 x 1 Gaudryceras varicostatum van Hoepen. SAS FB11, St Lucia Formation, southern part of False Bay, Zululand (precise horizon unknown, probably Coniacian or Santonian). See also PL 3; PL 7, fig. 2; PL 14, fig. 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 British Museum (Natural History). London : BM(NH)
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