One child (Mr. Skeleton) stands in the middle of the circle of children with eyes closed. With 24 children, I'd suggest having 3 or 4 Mr. Skeletons at a time in the middle of the circle with 3 or 4 bones passed out. Let the skeletons take turns guessing.
The children chant:
Mr Skeleton where's your bone?
Somebody stole it from your home.
Guess who? Maybe you!
Maybe a ghost from Kalamazoo
Now Mr. Skeleton find your bone!
While they are chanting the leader hands a "bone" (a pencil would work or you could cut a bone shape from cardboard) to one of the children. All the kids put their hands behind their backs and then Mr. Skeleton opens his eyes. He guesses who has the bone (you can either give three guesses and then he has to be Mr. Skeleton again if he guesses wrong or you can let them guess until they succeed). The person who had the bone becomes the new Mr. Skeleton.