The third, vyuha is Pradyumna. The name in the pradyumnah (640) means 'He who has immense wealth. It is also the name of one of the vyuhas.
The fourth vyuha is Aniruddha. The name aniruddhah (185) means 'He who is unobstructed in His manifestations by anyone.' It refers, to the fourth vyuha (638).
The name caturvyuhah (767) may also be taken to mean, on the authority of a text of the Aitareya-upanisad the four-fold person: the person in the body, the person in the chandas (metre), the person in the Veda, and the great person. The name caturmurtih (765) indicates the four forms of the Self: Virat, Sutratman, Avyakrta, and Turiya - the first three stand, respectively for the 'Self as associated with the gross world, the subtle universe, and the unman fest cause, and the last is the unconditioned Self.
The incarnated (avatara) form of the Lord is what figures Prominently in the Epics and the Puranas. The principle of incarnation is set forth in the Bhagavad-Gita where Sri Krsna declares: "Whenever dharma declines and adharma is on the ascendant, I incarnate myself in every age, in order to protect the good and punish the wicked." There are several incarnations referred to in the legends.