  Recent redshift surveys have shown that the excess galaxies seen in faint
galaxy number counts (above those expected given the local galaxy luminosity
function) are not evolved giants at high redshifts, but low to moderate
luminosity objects at more modest redshifts. This has led to the suggestion
that there was once an additional population of dwarf galaxies which has since
disappeared, ie. there is non-conservation of galaxy number. Here we
investigate the possibility that these disappearing dwarfs have actually
evolved to become the population of very low surface brightness galaxies which
is now being detected in nearby clusters.
