俱舍論記 11.117

11.117

「傍生壽至壽五百歲」者，明傍生鬼壽量。難陀，此云喜。言八龍王者，《法花經》云「有八龍王，難陀龍王、跋難陀龍王、娑伽羅龍王、和修吉龍王、德叉迦龍王、阿那婆達多龍王、摩那斯龍王、優盋羅龍王。」

Regarding "The lifespan of animals […] their lifespan is five hundred years": this explains the lifespans of animals and ghosts. Nanda is translated here as joy. Regarding the "eight dragon kings": the *Lotus Sūtra* says: "There are eight dragon kings: Nanda the dragon king, Upananda the dragon king, Sāgara the dragon king, Vāsuki the dragon king, Takṣaka the dragon king, Anavatapta the dragon king, Manasvin the dragon king, and Utpalaka the dragon king."