| 1. | There are no visible growth lines of conchiolin in cross-sections of sclerites.
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| 2. | The outer surface of the valves is covered with concentric growth lines.
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| 3. | That has put a bubble in the middle of the growth line,
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| 4. | Growth lines biconvex with prominent ventrolateral projections and a deep ventral sinus.
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| 5. | Fine arcuate growth lines appear in the interstices of the spiral keels.
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| 6. | The surface is covered with numerous longitudinal ridges and fine growth lines.
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| 7. | Many are covered with fine growth lines but are usually without ribbing.
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| 8. | Both types of growth lines may be deposited in synchrony with endogenous biorhythms.
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| 9. | The exteriors of the shells show faint ribbing and fine comarginal growth lines.
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| 10. | The exteriors of the shells show faint ribbing and �ne comarginal growth lines.
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मोबाइल