Skin-the-Goat, whose real name is James Fitzharris, is a real-life Dublin cabman and former member of the Invincibles. He famously drove the getaway car for the Phoneix Park murderers, and he appears in “Eumaeus” as a virulent, conspiratorial nationalist. Bloom doesn’t know whether to admire Skin-the-Goat’s courage or abhor his crime.