The authors carried out an electron microscope study of the ultrastructure of the L-form of meningococcus. Several types of cells differing by shape, size, and electron density were revealed. Sharply angular cells closely adjacent to one another prevailed in the culture. Structureless material, possibly representing material of cellular wall was not infrequently revealed around the cells. Elemental bodies and membranous structures of the lamellar type were revealed within the cells.