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baini Holcostephanus Sharpe compressa Diastopora Goldfuss
baini Modiola Sharpe
baini Mytilus Sharpe
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adult angle anterior aperture appears atherstoni baini becomes beds bone border Broom characters closely collection comparable comparison considerably convex Cretaceous curved described developed differs direction distal distinct dorsal doubt elongated evidence fauna figured flank fossils front frontal further genus Geol Geological greater greatest half height individual Jurassic known lateral length less lower margin marked measures middle Museum narrow Neocomian obtained occur ornamentation outline Owen passes phalanx Plate portion posterior present preserved probably proximal referred regarded region relatively represented resemblance ribs ridges Rogers rounded sculpture Seeley seems seen separated Sharpe shell short shown shows side similar slightly South African species specimen stage Sunday's River surface suture Tate traced Trigonia tubercles Uitenhage umbonal upper valve whorl width