Bhagavatapurana 5.24.31

5.24.31

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tato 'dhastāt pātāle nāga-loka-patayo vāsuki-pramukhāḥ śaṅkha-kulika-mahāśaṅkha-śveta-dhanañjaya-dhṛtarāṣṭra-śaṅkhacūḍa-kambalāśvatara-devadattādayo mahā-bhogino mahāmarṣā nivasanti yeṣām u ha vai pañca-sapta-daśa-śata-sahasra-śīrṣāṇāṃ phaṇāsu viracitā mahā-maṇayo rociṣṇavaḥ pātāla-vivara-timira-nikaraṃ sva-rociṣā vidhamanti //

31. Still lower, *i. e.*, in the lowermost region of Patala live the chiefs of the Naga race (serpents) headed by Vasuki, with the eminent members named *Sankha, Kulika, Maha-Sankha, Sveta, Dhritarashtra, Sankachuda, Kambala, Aswahara, Devadatta*

and others, possessed of extensive hoods, highly revengeful; in their hoods which are a thousand are set big jewels of great effulgence by which the collected darkness in the pit of Patala is completely dispelled.