Two large, elongate, parietal chromatophores are present; they are usually
placed laterally in the body, but their shape and position change with the
change in shape of the body (Text-figs. 24-28). The chromatophores are
golden-brown in colour; in actively motile individuals they appear to have
a faint greenish tinge to the gold, but in older slow-movit;1g individuals,
palmelloid-phases and cysts the colour of the chromatophore lacks the slight
tinge of green. A small dark red stigma, ovoid in shape, is most frequently
in a median position, more rarely at the extreme anterior end. It does not
project above the general surfac~ of the cell. The nucleus, just visible in living
individuals, is nearly always median; no mouth-band could be distinguished
and no vacuoles are developed.