Figure 11.

Three views from CAT of auditory region of Mirounga leonina showing the paries that limit the tympanic cavity. (A) View of a lateral, parasagittal section. (B) View of section through a ventral horizontal plane. (C) View of section through ventral horizontal plane comparing two specimens of different age classes CI (to the left) and CIII (to the right), showing the difference in relative development of the meatus acusticus externus and the Eustachian tube, as well as different internal morphology of the bulla. Skulls in dorsal and lateral view show the precise line of each section.