This is a report of a new familial neurologic disorder characterized by ceroid-lipofuscin storage, sea-blue histiocytes, and associated neurologic findings. Neurologic manifestations in the family members examined were varied, but posterior column involvement was the most common finding. The presence of sea-blue histiocytes was genetically determined by an autosomal dominant trait. Vitamin E blood concentrations were decreased in the absence of absorption difficulties in two sisters who were most seriously affected. The relationship of ceroid-lipofuscin, lipid peroxidation, and vitamin E is discussed.