Report on Some Points in the Anatomy of the Thylacine (Thylacinus Cynocephalus), Cuscus (Phalangista Maculata), and Phascogale (Phascogale Calura), Collected During the Voyage of H.M.S. Challenger in the Years 1873-1876: With an Account of the Comparative Anatomy of the Intrinsic Muscles and the Nerves of the Mammalian Pes