Bhagavatapurana 10.45.40

10.45.40

/0 śrī-samudra uvāca
na cāhārṣam ahaṃ deva daityaḥ pañcajano mahān /
antar-jala-caraḥ kṛṣṇa śaṅkha-rūpa-dharo 'suraḥ //

40 & 41. The sea said:—‘O Lord, I did not carry him away. O Krishna, there is a great Daitya called Panchajana roaming through my waters; he is an asura in the form of a Sankha: (and by him the boy was indeed abstracted.” On hearing that, the Lord at once) plunged into the waters and killed the Daitya: but the child was not to be found in his bowels.