. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 294 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 147. Schematic representation of the rib pattern of Olco- stephanus {Olcostephanus) baini var. sphaewidalis (Spath) (<$) on PEM-1462/76a (ac = apertural constriction). 60 20. 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