An extensive optical/IR local galaxy sample. What can you say about the morphological type distribution, by eye? [Z. Frei & J. Gunnn]

A rough census of observed galaxies yields morphological fractions of 20% elliptical, 77% spiral, 3% irregular. A volume-limited sample would give results closer to 12% elliptical, 34% spiral, and 54% irregular. What causes these biases?