. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 308 ANNALS OF THE SOUTH AFRICAN MUSEUM Oxytropidoceras (Oxytropidoceras) boesei Knechtel, 1947 Figs 29-31A Oxytropidoceras (Manuaniceras) bosei Knechtel, 1947: 109, pi. 27 (fig. 1). ? Manuaniceras uddeni Young, 1966: 95, pi. 12 (figs 1, 4-5), pi. 13 (fig. 1), pi. 16 (figs 1, 3), figs 10b, 12b. Material Three specimens, SAM-PCA5452-5453 and an unnumbered example in the South African Museum, preserved as limestone steinkerns. Description The Angolan material comprises several rather eroded internal mou
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 308 ANNALS OF THE SOUTH AFRICAN MUSEUM Oxytropidoceras (Oxytropidoceras) boesei Knechtel, 1947 Figs 29-31A Oxytropidoceras (Manuaniceras) bosei Knechtel, 1947: 109, pi. 27 (fig. 1). ? Manuaniceras uddeni Young, 1966: 95, pi. 12 (figs 1, 4-5), pi. 13 (fig. 1), pi. 16 (figs 1, 3), figs 10b, 12b. Material Three specimens, SAM-PCA5452-5453 and an unnumbered example in the South African Museum, preserved as limestone steinkerns. Description The Angolan material comprises several rather eroded internal moulds of body chamber fragments that, because of scaphitoid-uncoiling of the body chamber, appear to be more evolute (umbilicus 33 % of the diameter) than the earlier growth stages actually were. The shell is strongly compressed, with a lanceolate whorl section (Fig. 30) and broad, convex flanks. Maximum width is about one-third of the way up the flanks. Although the siphonal keel is not preserved, it certainly stood well above the venter. Ornament comprises dense, flexuous flank ribs that arise at, or close to, the umbilical seam and pass forward across the flanks. The ribs are narrower than the interspaces with a steep, concave, adoral surface and a sloping, convex, adapical face. They frequently bifurcate close to the umbilical seam, but only rarely at, or above, mid-flank. There are 8-9 ribs along the venter in a distance equal to the whorl height. There is no sign of bullae on any part of the 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
