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