Abstract
The distribution and sizes of ganglion cells in the retinae of two species of the nocturnal prosimian primate galago were investigated. The distribution of ganglion cells in both species is not uniform, ranging from 12,000 cells/mm 2 in the area centralis to 300 cells/mm 2 in the periphery. Isodensity contours also reveal specialized areas of high ganglion cell density forming a cruciform pattern around the area centralis with horizontal and vertical extensions oriented approximately along the zero meridians. Analysis of cell areas demonstrates that the central area contains exclusively small to medium-sized cells (25–90 μ 2) with large cells (>100 μ 2) first appearing approximately 1 mm from the area centralis.
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