"TUNING FORK" CLASSIFICATION OF RICH CLUSTERS OF GALAXIES

A classification scheme of rich clusters of galaxies based on the distribution of the ten brightest member galaxies is described. The cluster types, which fall naturally into an ordered sequence with criteria varying systematically from one end to the other, can be represented by a "tuning fork" diagram: $cD - B\langle _{C - I}^{L - F} $ Preliminary types are listed for the 111 Abell clusters with distance classes less than four.