a species of Ecnites (for which see Encycl.), very common in the woods of North Africa. It is a shrub, of which the leaves, when boiled with a small quantity of water, yield a thick black juice, into which the negroes dip a cotton thread. This thread they fasten round the iron of their arrows, in such a manner that it is almost impossible to extract the arrow when it has sunk beyond the barbs, without leaving the iron and the poisoned thread in the wound. The poison of the koona is said to be very deadly.—Park's Travels.