Not to be confused with Book of Spells.
The Book of Shells is a book owned by Squidward. It only appears in the episode "I ♥ Dancing."
The book is dark green with yellow letters on it that say reads the book's title. The inside of the book is never seen, but it can possibly be about shells for snails and other sea creatures.
Role in episode
is supposed to Moonwalk on Squidward's treadmill, Squidward goes away to read this book.