Radial velocities in the Coma cluster, many of them new, are analyzed in conjunction with previous data on the density distribution. The cluster extends more than 200' in radius, with bright and faint galaxies distributed nearly the same. Some spirals are members. Several different determinations of I7L give values around 250. The cluster is stabilized by a missing mass" some 7 times the mass of the galaxies, which must he distributed in the same way as the galaxies.