Why are sand dollars called sand dollars?

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Tags

1. #these
2. #thought
3. #spanish
4. #found
5. #white
6. #skeletons
7. #coins
8. #being
9. #american
10. #ashore
11. #called
12. #dollar
13. #tests
14. #dollars
15. #bleached
16. #people
17. #looked
18. #bright
19. #usually