  We consider a sample of about 50 distant galaxy clusters at z>0.15 (<z> about
0.3), each cluster having at least 10 galaxies with available redshift in the
literature. We select member galaxies, analyze the velocity dispersion
profiles, and evaluate in a homogeneous way cluster velocity dispersions and
virial masses. We apply the same procedures already recently applied on a
sample of nearby clusters (z<0.15) in order to properly analyze the possible
dynamical evolution of galaxy clusters. We do not find any significant
difference between nearby and distant clusters. In particular, we consider the
galaxy spatial distribution, the shape of the velocity dispersion profile, and
the relations between velocity dispersion and X-ray luminosity and temperature.
Our results imply little dynamical evolution in the range of redshift spanned
by our cluster sample, and suggest that the typical redshift of cluster
formation is higher than that of the sample we analyze.
