Sharp stones [are] under him,.... And yet give him no pain nor uneasiness;he spreadeth sharp pointed things upon the mire; and makes his bed of them and lies upon them; as sharp stones, as before, shells of fishes, broken pieces of darts, arrows, and javelins thrown at him, which fall around him: this does not so well agree with the crocodile, the skin of whose belly is soft and thin; wherefore dolphins plunge under it and cut it with a thorn, as Pliny relates, or with spiny fins ; but with the whale, which lies among hard rocks and sharp stones, and large cutting pieces of ice, as in the northern seas.
Nat. Hist. l. 8. c. 25. Sandys's Travels, l. 2. p.