The Sting Ray
Pliny mentions the Sting Ray, and ascribes to it marvellous powers,
which it does not possess:--"There is nothing more to be dreaded than
the sting which protrudes from the tail of the Trygon, by our people
known as the Pastinaca, a weapon five inches in length. Fixing this in
the root of a tree, the fish is able to kill it; it can pierce armour,
too, just as though with an arrow, and to the strength of iron it adds
all the corrosive qualities of poison."