Concerning this theory, it may be said that the earliest descriptions, both written and pictorial, which have been discovered of the reptilian monsters around which grew the germs of our dragon-myths, are crocodiles or serpents, and not dragons of any conventional kind,--with a few doubtful exceptions. In an Egyptian papyrus there is a hieroglyphic picture of San-nu Hut-ur, 'plunger of the sea;' it is a marine, dolphin-like monster, with four feet, and a tail ending in a serpent's head. [219] With wings, this might approach the dragon-form. Again, Amen-Ra slew Naka, and this serpent 'saved his feet.' Possibly the phrase is ironical, and means that the serpent saved nothing; but apart from that, the poem is too highly metaphorical--the victorious god himself being described in it as a 'beautiful bull'--for the phrase to be important. On Egyptian monuments are pictured serpents with human heads and members, and the serpent Nahab-ka is pictured on amulets with two perfect human legs and feet. [220] Winged serpents are found on Egyptian monuments, but almost as frequently with the incredible number of four as with the conceivable two wings of the pterodactyl. The forms of the serpents thus portrayed with anthropomorphic legs and slight wings are, in their main shapes, of ordinary species. In the Iranian tradition of the temptation of the first man and woman, Meschia and Meschiane, by the 'two-footed serpent of lies.' And it is possible that out of this myth of the 'two-footed' serpent grew the puzzling legend of Genesis that the serpent of Eden was sentenced thereafter to crawl on his belly. The snake's lack of feet, however, might with equal probability have given rise to the explanation given in mussulman and rabbinical stories of his feet being cut off by the avenging angel. But the antiquity of the Iranian myth is doubtful; while the superior antiquity of the Hindu fable of Ráhu, to which it seems related, suggests that the two legs of the Ahriman serpent, like the four arms of serpent-tailed Ráhu, is an anthropomorphic addition. In the ancient planispheres we find the 'crooked serpent' mentioned in the Book of Job, but no dragon. The two great monsters of Vedic mythology, Vritra and Ahi, are not so distinguishable from each other in the Vedas as in more recent fables. Vritra is very frequently called Vritra Ahi--Ahi being explained in the St. Petersburg Dictionary as 'the Serpent of the Heavens, the demon Vritra.' Ahi literally means 'serpent,' answering to the Greek echi-s, echi-dna; and when anything is added it appears to be anthropomorphic--heads, arms, eyes--as in the case of the Egyptian serpent-monsters. The Vedic demon Urana is described as having three heads, six eyes, and ninety-nine arms.