| 摘 要： | The structure of retina of the Lipotes Vexillifer has been studied quantitatively under light microscope. The results obtained are as follows.(ⅰ) The thickness of the retina is 268 μm. The lamination of retina can be clearly distinguished. It consists of 10 layers. The thicknesses of the layers from pigment epithelium to internal limiting membrane are 12 μm, 44 μm, 2 μm, 48 μm, 20 μm, 36 μm, 68 μm, 32 μm, 8 μm and 2 μm respectively.(ⅱ) The number of cells in the outer nuclear layer is larger than that in the inner nuclear layer. Two types of cell can be distinguished in this layer. The number of receptors and ganglion cells is in a ratio of 12 to 1. These results show that the retina type of the Lipotes corresponds to that of nocturnal animals.(ⅲ) The diameters of ganglion cells range 1.5—37 μm with two peaks at 6 μm and 35 μm. This means that the ganglion cells fall into two groups according to size, and this has been proved by the observation on morphology of ganglion cells in the wh
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