On the end of its tail is the planet of Dhruva, on the body of its tail are the planets of the demigods Prajapati, Agni, Indra and Dharma, and at the base of its tail are the planets of the demigods Dhata and Vidhata

Expressions researched:
"On the end of its tail is the planet of Dhruva, on the body of its tail are the planets of the demigods Prajapati, Agni, Indra and Dharma, and at the base of its tail are the planets of the demigods Dhata and Vidhata"

Srimad-Bhagavatam

SB Canto 5

On the end of its tail is the planet of Dhruva, on the body of its tail are the planets of the demigods Prajapati, Agni, Indra and Dharma, and at the base of its tail are the planets of the demigods Dhata and Vidhata.

SB 5.23.5, Translation

This form of the śiśumāra has its head downward and its body coiled. On the end of its tail is the planet of Dhruva, on the body of its tail are the planets of the demigods Prajāpati, Agni, Indra and Dharma, and at the base of its tail are the planets of the demigods Dhātā and Vidhātā. Where the hips might be on the śiśumāra are the seven saintly sages like Vasiṣṭha and Aṅgirā. The coiled body of the Śiśumāra-cakra turns toward its right side, on which the fourteen constellations from Abhijit to Punarvasu are located. On its left side are the fourteen stars from Puṣyā to Uttarāṣāḍhā. Thus its body is balanced because its sides are occupied by an equal number of stars. On the back of the śiśumāra is the group of stars known as Ajavīthī, and on its abdomen is the Ganges that flows in the sky [the Milky Way].