. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 117. Olcostephanus {Olcostephanus) baini baini (Sharpe) (<?). Whorl sections of SAM-PCU1528 (left), PEM-1462/76 (right).. 90 300 90 270 Fig. 118. Plot showing the differing rates of inflation for macroconchs of O. baini (left) and O. atherstoni (right). Note increased rate of inflation in middle whorls of O. baini. bolae but, when preserved, the adoral margin is seen to bear slightly converging lateral lappets. The whorl section varies somewhat, from almost semicircular to coronate, with a we
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 117. Olcostephanus {Olcostephanus) baini baini (Sharpe) (<?). Whorl sections of SAM-PCU1528 (left), PEM-1462/76 (right).. 90 300 90 270 Fig. 118. Plot showing the differing rates of inflation for macroconchs of O. baini (left) and O. atherstoni (right). Note increased rate of inflation in middle whorls of O. baini. bolae but, when preserved, the adoral margin is seen to bear slightly converging lateral lappets. The whorl section varies somewhat, from almost semicircular to coronate, with a well-rounded venter. The suture line is unknown. As in other olcostephanids the body chamber is almost a full whorl in length. Macroconch (?): The shell is very large, commonly around 250 mm diameter, and extremely inflated, with a strongly depressed whorl section. The earliest whorls are only moderately inflated and up to a diameter of about 60 mm closely resemble the microconch, from which they differ only in being slightly more inflated and in having invariably three secondaries per bulla,. 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
