| 1. | Growth lines are usually biconvex, forming ventral and lateral sinuses.
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| 2. | Growth lines biconvex with prominent ventrolateral projections and a deep ventral sinus.
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| 3. | Terebratulids typically have biconvex shells that are usually ovoid to circular in outline.
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| 4. | In shape they are sub-circular to elliptical, with typically biconvex valves.
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| 5. | The lens is biconvex, and the body of the stemma has a vitreous or crystalline core.
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| 6. | The biconvex shell was typically 2.5 cm long, but sometimes grew to 4 cm.
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| 7. | The biconvex centra in some of the cryptodiran cervicals allow the neck to fold onto itself in the vertical plane.
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| 8. | The overseeing committee was concerned that the biconvex wing would not give sufficient altitude for testing the aircraft in a dive.
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| 9. | Venetian nobleman Daniello Barbaro ( 1513-1570 ) described using a camera obscura with a biconvex lens as a drawing aid.
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| 10. | The shell of " Potamolithus rushii " is imperforate, wider than high, biconvex, very solid and strong.
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