  Previous observations of the nontransient oscillations of rising bubbles and
falling spheres in wormlike micellar fluids were limited to a single surfactant
system. We present an extensive survey of rising bubbles in another system, an
aqueous solution of cetylpyridinium chloride and sodium salicylate, with and
without NaCl, across a range of concentrations and temperatures. Two different
types of oscillation are seen in different concentration ranges, each with its
own temperature dependence. Rheological data allows for the identification of
these different hydrodynamic states with different fluid microstructures.
