. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 104. Olcostephanus {Jeannoticeras) frequens (Zwierzycki) {$). The holotype of Olcostephanus popenoei Imlay from the Upper Valanginian of Oregon (after Imlay 1960). x Fig. 105. Olcostephanus {Jeannoticeras) colorinensis Imlay (?). The holotype from the Taraises Formation of northern Mexico (after Imlay 1938). x 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 no

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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 104. Olcostephanus {Jeannoticeras) frequens (Zwierzycki) {$). The holotype of Olcostephanus popenoei Imlay from the Upper Valanginian of Oregon (after Imlay 1960). x Fig. 105. Olcostephanus {Jeannoticeras) colorinensis Imlay (?). The holotype from the Taraises Formation of northern Mexico (after Imlay 1938). x 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