Mahabharata 1.31.11

नागः शङ्खनकश्चैव तथा च स्फण्डकोऽपरःक्षेमकश्च महानागो नागः पिण्डारकस्तथा

nāgaḥ śaṅkhanakaścaiva tathā ca sphaṇḍako'paraḥkṣemakaśca mahānāgo nāgaḥ piṇḍārakastathā

Our plain-language meaning of this verse is waiting for scholar review.