  (Abridged) We analyse Hubble Space Telescope images of a complete sample of
341 galaxies drawn from both the Canada France and Autofib/Low Dispersion
Survey Spectrograph ground-based redshift surveys. We discuss morphological
classifications of these galaxies, and quantify possible biases that may arise
from various redshift-dependent effects. We then discuss these biases in the
context of automated classifications, and quantify the expected
misclassification in our system. After allowing for such biases, the redshift
distribution for normal spirals, together with their luminosity function
derived as a function of redshift, indicates approximately 1 magnitude of
luminosity evolution in B(AB) by z=1. The elliptical sample is too small for
precise evolutionary constraints. However, we find a substantial increase in
the proportion of galaxies with irregular morphology at large redshift. These
galaxies also appear to be the dominant cause of the rapid rise with redshift
in the blue luminosity density identified in the redshift surveys. Although
galaxies with irregular morphology may well comprise a mixture of different
physical systems and might not correspond to present day irregulars, it is
clear that the apparently declining abundance and luminosities of our distant
``irregulars'' holds an important key to understanding recent evolution in the
star formation history of normal galaxies.
