Umbones sentence example

umbones
  • Solenopsidae.-Shell equivalve, greatly elongated, umbones very far forward.
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  • The young Brachiopod in all its species is protected by an embryonic shell called the " protegulum," which sometimes persists in the umbones of the adult shells but is more usually worn off.
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  • Hinge pliodont, that is to say, it has numerous teeth on either side of the umbones and the teeth are perpendicular to the edge.
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  • Philobryidae.-Shell thin, very inequilateral, anterior part atrophied, umbones projecting.
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  • Trigonia; shell sub-triangular, umbones directed backwards.
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  • Prasinidae.-Shell inequilateral, with anterior umbones and prominent anterior auricula; cardinal border arched..
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  • Isocardiidae.-Mantle largely closed, pedal orifice small; gill-plates of equal size; shell globular, with prominent and coiled umbones.
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  • Chamidae.-Shell with sub-equal valves and prominent umbones more or less spirally coiled; ligament external.
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