Optic lobe Cerebellum siculus of brain Sacculus Olfactory lobe apena bladder of brain Naris Narial flap Neural of trunk vertebra Antenor vertical lar canal htercalarlum Weberian Horizontal apparatu scaphium semicircular canal Posterior vertical Transverse canal semicircular canal between sacrum Fig 3.25 Diagrammatic dissection of the head of a minnow (Cyprinidae) showing posi tion of semicircular canals of inner ear, and relationships to Weberian apparatus and ras bladder in cypriniforms(Based on von Frisch in Young, 1950)9