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These notes merely intend to memorialize Souriau's overlooked achievementsregarding geo\-metric quantization of Poincar\'e-elementary symplectic systems.Restricting attention to his model of massless, spin-$\half$, particles, wefaithfully rephrase and expound here Sections (18.82)--(18.96) &(19.122)--(19.134) of his book \cite{SSD} edited in 1969. Missing details aboutthe use of a preferred Poincar\'e-invariant polarizer are provided forcompleteness.

A recollection of Souriau's derivation of the Weyl equation via geometric quantization