tocene horses of northeastern Siberia, the Przewalski horse, and domestic horses of aboriginal breeds of the eastern group. MATERIAL AND METHODS Taking into account individual age of the Bilibino

The skull of a mummy horse from the Late Pleistocene of the western Chukchi Peninsula is described. This is the seventh horse mummy recorded during the past 150 years in the Pleistocene permafrost of Siberia. Because of unique preservation (the skeleton is covered by soft tissues and skin) and young indi vidual age (1–1.5 years of age), it is presently impossible to provide its correct species allocation of this spec imen. Morphological features of the skull proportions and dentition of the Bilibino horse apparently reflect both species and individual characteristics of the structure and development.