. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 173 Kossmaticeras (Kossmaticeras) theobaldianum crassicostata Collignon, 1954 Figs 3-4 non Ammonites theobaldianus Stoliczka, 1865: 161 (pars), pi. 78 (fig. 3-3a only), non Holcodiscus theobaldianus Stoliczka, Grobberippte Varietat: Kossmat, 1897: 36 (143). Kossmaticeras theobaldi Stoliczka, var. crassicostata Collignon, 1954: 17, pi. 1 (fig. 3), pi. 2 (fig. 1); 1955: 21, pi. 1 (fig. 3), pi. 2 (fig. 1); 19656: 24, pi. 423 (fig. 1756), pi. 424 (fig. 1757). Type Holo
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 173 Kossmaticeras (Kossmaticeras) theobaldianum crassicostata Collignon, 1954 Figs 3-4 non Ammonites theobaldianus Stoliczka, 1865: 161 (pars), pi. 78 (fig. 3-3a only), non Holcodiscus theobaldianus Stoliczka, Grobberippte Varietat: Kossmat, 1897: 36 (143). Kossmaticeras theobaldi Stoliczka, var. crassicostata Collignon, 1954: 17, pi. 1 (fig. 3), pi. 2 (fig. 1); 1955: 21, pi. 1 (fig. 3), pi. 2 (fig. 1); 19656: 24, pi. 423 (fig. 1756), pi. 424 (fig. 1757). Type Holotype by original designation, the specimen figured by Collignon (1954, pi. 2 (fig. 1)) from the Coniacian of Ampozalaoka, Madagascar. Material BMNH C83330, from locality 13, hill slopes below Riverview Compound, 750 m north of the sugar-cane railway bridge across the Mfolozi, south of Mtubatuba, Zululand, St. Lucia Formation, Coniacian II. Description The specimen is a beautifully preserved, wholly septate, fragmentary individual with an estimated original diameter of 50 mm. It retains well-preserved recrystallized shell. Coiling is moderatedly evolute, less than half the previous whorl being concealed, with a fairly deep umbilicus that comprises an estimated 30 per cent of the total diameter. The whorl section is equidimensional in section. The greatest breadth is at the umbilical bulla, the flanks are broadly rounded or flattened, merging with a more narrowly rounded venter. Strong umbilical bullae give rise to single or, more rarely, to pairs of primary ribs. These are narrow and distant, prorsiradiate, passing straight across the inner flank, thereafter flexing backward across the remainder of the flank and passing. 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 Mus
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
