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So Perseus flitted onward to the north-east, over many a league of sea, till he came to the rolling sand-hills and the dreary Lybian shore.
And he flitted on across the desert: over rock-ledges, and banks of shingle, and level wastes of sand, and shell-drifts bleaching in the sunshine, and the skeletons of great sea-monsters, and dead bones of ancient giants, strewn up and down upon the old sea-floor. And as he went the blood-drops fell to the earth from the Gorgon's head, and became poisonous asps and adders, which breed in the desert to this day.