Contains the lapillus or utriculith otolith, usually the smallest, in Teleostei and minute particles of calcium carbonate called otoconia in endolymph in Elasmobranchii.

• 包含微石或耳石，通常最小的，在真骨鱼类是碳酸钙的细小粒子叫做耳微粒在板鳃亚纲的内淋巴液。也被称为小囊。