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The spider’s legs bent in upon its body
I think: The spider's legs bent inward on top of its body not under its body. I found this sentence in Harry Potter
I want to know what this process looks like. (the way its legs are bent, the shape it gets into. Basically, What a native speaker would understand when he or she reads it)
In this context, I think it's fair to assume that the author intends the reader to have only a basic understanding of how a spider moves. Therefore, I visualize this sentence as a spider with its legs folded under the body not over the body since a spider's legs don't naturally move in that way. Here's a picture similar to how I would visualize it:
