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All poi cm 'i.s m :}'■. ::,.-: iiuvc movable facgs, hii li . ;'( lc . UU in the upp( r jaWj and vvhrii r, i is use close np likr1 tllè blade oí' a peiiknife. The faug is proyided with a dpct leading lo the poisoii sac, and tlie virus i.s èjected througli this duet by pressure. At the base of every poison faug there are iramerous germs of others, and the fang broken or lost is replaced in a few weeks by the giwvth of another.