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baini Mytilus Sharpe
COMPARISON WITH EXTRAEUROPEAN FAUNAS
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adult African angle anterior aperture appears atherstoni baini Band becomes beds bone border characters closely collection comparable comparison considerably convex Cretaceous curved d'Orbigny delicate described developed differs Dimensions direction distinct distinguished doubt elongated evidence fauna figure flank fossils front frontal further genus Geol greater greatest growth half height herzogi individual Jurassic known lateral length less lower margin marked measures middle Museum narrow Neocomian obtained occur Oomia ornamentation outline pass Plate portion posterior present preserved probably prominent referred regarded region relatively remarks represented resemblance ribs ridges Rogers rounded sculpture seems seen separated Sharpe shell shown shows side similar single slightly South African species specimen spiral stage strongly Sunday's River surface Tate traced Trigonia tubercles Uitenhage umbilical umbo umbonal upper valve ventricosa whorl