The central nervous system (CNS) of Hippocampus barbouri at 35 DAB. (1, 2) Morphology and schematic diagram of the CNS in a longitudinal view. The brain contained cerebral hemisphere (Ch), optic tectum (Otc), cerebellum (Cb), hypothalamus (Hy) and modular oblongata (Mo). The spinal cord (Sc) was also observed. (3) Morphology of the brain in lateral view. (4, 5) Morphology and schematic diagram of the brain at high magnification. The olfactory lobe (Ol), Ch, Otc, Cb and Mo were observed. (6) Brain morphology in dorsal view. (7, 8) Morphology and schematic diagram of the brain in dorsal view at high magnification.(9–11) Morphology and schematic diagram of longitudinal sections showing the olfactory tract (Ot), Ch, Otc, Cb, Hy and Mo. Scale bars: 1, 3, 6, 9 = 3 cm, 4, 7 = 0.5 cm.