  The actions of 0-Kashiwara operators on the $U'_q(G_2^{(1)})$-crystal $B_l$
in [Yamane S., J. Algebra 210 (1998), 440-486] are made explicit by using a
similarity technique from that of a $U'_q(D_4^{(3)})$-crystal. It is shown that
$\{B_l\}_{l\ge1}$ forms a coherent family of perfect crystals.
