Jeffrey in his review of the _Lamia_ volume has a fine phrase about this passage. It 'comes of no ignoble lineage,' he says, 'nor shames its high descent.' How careful Shelley's study of the passage had been, and how completely he had assimilated it, is proved by his, doubtless quite unconscious, reproduction and amplification of it in the fourth act of _Prometheus Unbound_, which he added as an afterthought to the rest of the poem in December 1819. The wreckage described is not that of the sea, but that which the light flashing from the forehead of the infant Earth-spirit reveals at the earth's centre. The beams flash on And make appear the melancholy ruins Of cancelled cycles; anchors, beaks of ships; Planks turned to marble; quivers, helms, and spears, And gorgon-headed targes, and the wheels Of scythed chariots, and the emblazonry Of trophies, standards, and armorial beasts, Round which death laughed, sepulchred emblems Of dead destruction, ruin within ruin! The wrecks beside of many a city vast, Whose population which the earth grew over Was mortal, but not human; see, they lie, Their monstrous works, and uncouth skeletons, Their statues, homes and fanes; prodigious shapes Huddled in gray annihilation, split, Jammed in the hard, black deep; and over these, The anatomies of unknown winged things, And fishes which were isles of living scale, And serpents, bony chains, twisted around The iron crags, or within heaps of dust To which the tortuous strength of their last pangs Had crushed the iron crags; and over these The jagged alligator, and the might Of earth-convulsing behemoth, which once Were monarch beasts.