  We have looked for differences in the galaxy properties along the Hubble
sequence and for the dependence of these properties on the environment, in an
absolute magnitude complete sample of 187 galaxies in the Coma cluster. The
morphological type of all galaxies was determined from our own high resolution
data. We also compared this sample with other published complete samples of
galaxies in the Perseus and Virgo clusters and in the local field. Ellipticals
and lenticulars are highly homogeneous in all their internal photometric
properties. These galaxies are well described just by their morphological type
and luminosity, regardless of the environment. On the other hand, some of the
external properties of these galaxies and of their subclasses differ markedly.
Then, for early-type galaxies, the environment determines the space density of
each type but not the internal properties of the type, which are the same in
all environments. Spirals form a heterogeneous class of objects whose
photometric properties depend on one extra parameter related to the
environment. The spatial distribution of spirals as a whole class is uniform.
For spirals, therefore, the environment does not determine the space density,
which is the same in all environments, but strongly affects the internal galaxy
properties. The galaxies in Coma, as in Perseus, are segregated primarily with
respect to the supercluster main direction, thus providing a new interpretation
of the morphology-radius and morphology-density relations.
