| 11. | The Short hinge line helps distinguish the pentamerids from the ancestral orthids from which they are obviously derived.
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| 12. | The fin and rudder formed a tilted, cropped parallelogram with a hinge line above that of the elevator.
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| 13. | With progressive subsidence of the basin during the Pennsylvanian, the western basin hinge line and carbonate shelf, continued migrating west.
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| 14. | These flaps are slotted and are each in two spanwise parts, the break placed at the wing fold hinge line.
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| 15. | The beak is slightly elevated above the hinge lines and the beak sculpture consists of 3 to 5 wavy lines.
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| 16. | The glacier has a hinge line, the point at which its projecting tongue leaves the sea bed and starts to float.
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| 17. | All ark shells have a long straight hinge line with a single row of numerous small and unspecialized " teeth ".
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| 18. | The hinge line corresponds to the animal's dorsal side, though when living it usually rests " sideways ", on its right.
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| 19. | The two valves usually articulate with one another using structures known as " teeth " which are situated along the hinge line.
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| 20. | The outer portions were more lightly constructed, and designed to snap off at the hinge line if the g-force exceeded 7.5 g.
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