  We study the liquid crystalline phase behavior of a concentrated suspension
of helical flagella isolated from {\it Salmonella typhimurium}. Flagella are
prepared with different polymorphic states, some of which have a pronounced
helical character while others assume a rod-like shape. We show that the static
phase behavior and dynamics of chiral helices are very different when compared
to simpler achiral hard rods. With increasing concentration, helical flagella
undergo an entropy driven first order phase transition to a liquid crystalline
state having a novel chiral symmetry.
