What is a Seabiscuit shell?

Related questions

1. What does Sea Biscuit mean?
2. What are ships biscuits made of?
3. What is hardtack and why was it used at sea?
4. Did pirates drink straight rum?
5. What is the difference between pancakes and Johnny cakes?
6. Who invented hardtack?
7. Why are sand dollars called sand dollars?
8. What did pirates eat and drink?
9. Does hardtack taste good?
10. How do you eat hardtack?

Tags

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2. #dollar
3. #biscuits
4. #clypeasteroida
5. #within
6. #urchins
7. #africa
8. #extremely
9. #snapper
10. #burrowing
11. #pansy
12. #zealand
13. #order
14. #flattened
15. #species
16. #south
17. #refers
18. #belonging
19. #biscuit
20. #cookie
21. #quite
22. #known