Abstract
Surface fine structures of t he buttocks callosity of a cynomolgous macaque (Macaca irus) were observed. The stratum corneum is composed of scales-like pattern of individual keratin cells. Pore-like depressions or sulci and villus-like projections or ridges were observed at the central portion of a shedding keratin cell. The size of these villuslike projecting structures corresponds to the individual size of the porelike structures. A relation between the depressions and projections is considered as a defence of shedding in the two piling keratin cells.
