| 41. | In bivalve mollusks, annuli are concentric growth rings in their shells.
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| 42. | These bivalves are the largest pearl oysters in the world.
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| 43. | This bivalve is sometimes preserved with mineralized soft-tissue.
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| 44. | The rear end is hardly narrowed, squarely cut off and bivalved.
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| 45. | The rear end is bivalved and the mouth angle is about 45?
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| 46. | The adult case is a bivalved, black, silken sheath case.
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| 47. | Like most other bivalves, these mollusks are suspension feeders.
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| 48. | The techniques for culturing geoducks is similar to that of other bivalves.
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| 49. | Bivalve mollusks generally have either one or two adductor muscles.
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| 50. | Bivalves, bryozoans, and gastropods also sustained heavy losses.
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