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It might be an African banana slug due to its location but it looks like Ariolimax californicus, a banana slug from California. Desmond.E.S.O suggested the group of banana slugs from N. America so it might be a pet or it got released.
There are several different species of ogre faced spider. Once you, someone else, or I figure out the species, you could remove sp. ! By the way, ogre faced spiders weave nets and scoop up passing prey below.