  It is shown that if the shell of the Vela supernova remnant is responsible
for nearly all the scattering of the Vela pulsar, then the scintillation and
proper motion velocities of the pulsar can only be reconciled with each other
in the case of nonzero transverse velocity of the scattering material. A
possible origin of large-scale transverse motions in the shell of the Vela
supernova remnant is discussed.
