For a fluid-filled titanium shell the form-function was calculated and numerically analysed. Apart from the bifurcation of the lowest antisymmetric Lamb wave, a_0, interaction between the subsonic and supersonic branches of a_0 and whispering gallery waves was observed. The symmetric Lamb wave, s_0, does not exist as a separate mode, its dispersion curve is formed by intervals the curves associated with whispering gallery modes. The spatial structure of the acoustic field was studied using sound intensity flow lines, calculated at several frequencies, including the resonances of a_(0-) and whispering gallery modes.
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