Published in "The World of Galaxies", eds. Harold G. Corwin, Jr. and Lucette Bottinelli, 1989

Abstract. A brief discussion of the de Vaucouleurs revised Hubble classification system is given, with special emphasis on ring and lens morphologies. The possible physical interpretations of each dimension of the system are summarized.

Table of Contents

INTRODUCTION

THE REVISED HUBBLE CLASSIFICATION SYSTEM (RHS)

EXTENSIONS AND ADDITIONS

Rings and Pseudo-Rings

Lenses

PHYSICAL INTERPRETATIONS OF REVISED HUBBLE CLASSIFICATIONS

CONCLUSIONS

REFERENCES

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