Fig. 1. Lateral view of the inner ear and brain of the Hawaiian sergeant fish, Abudefduf abdominalis. The saccule and lagena are positioned beneath the brain and oriented in the dorso-ventral plane along the presumed primary axis of particle motion during auditory evoked potential experiments. The position of the sensory macula is outlined and shaded within each otolithic endorgan, while the removed left otolith is illustrated below (large arrows). Dashed lines represent the location of the crista ampullaris of each semicircular canal, and the dotted line represents the position of the macula neglecta (mn). A, asteriscus otolith of lagena; ac, anterior canal; CE, cerebellum; hc, horizontal canal; HYP, hypothalamus; L, lapillus otolith of utricle; M, medulla; pc, posterior canal; S, sagitta otolith of saccule; T, tectum; TEL, telencephalon. Scale bar, 1 mm.