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Abstract
The outer and inner ears and the cochlear nuclei in the bat Plecotus auritus are described. The author has collected 20 specimens of this animal, whereof 10 were used for preparation of the cochlea, applying the method of H. Engström. In the other half the cochlear nuclei were prepared following the method described by the author in 1964. The volume of the cochlear nuclei and their number of nerve cells are computed and the distribution of the primary nerve fibres is described. The primary auditory centers in the bat are compared with those of the cat, the whales and homo.