Number of Kalpas1 - Verse 30-31

Those industrious, noble souls, well-versed in the Vedas, eulogising that Brahman Vamadeva, imparted instructions in piety for showering grace on the people who desired to receive instructions from them. Then at the end of a thousand years, they re-entered Rudra, the eternal great lord. L Vamadeva—another form of Siva. This too had four sons listed irk v. 28 below. This form appeared in the Rakta Kalpa.