  We perform a nonrelativistic contraction of N-extended Poincare superalgebra
with internal symmetry U(N) and general set of N(N-1) real central charges. We
show that for even N=2k and particular choice of the dependence of Z_{ij} on
light velocity c one gets the N-extended Galilei superalgebra with unchanged
number of central charges and compact internal symmetry algebra U(k;H)=USp(2k).
The Hamiltonian positivity condition is modified only by one central charge. If
we put all the central charges equal to zero one gets the 2k-extended Galilei
superalgebra as the subalgebra of recently introduced extended Galilei
conformal superalgebra [1,2].
