Atharvavedaparishishta 49.2.1

49.2.1

tatra yajurvedasya caturviṃśatir bhedā bhavanti || tad yathā | kāṇvāḥ | mādhyaṃdināḥ | jābālāḥ | śāpeyāḥ | śvetāḥ | śvetatarāḥ | tāmrāyaṇīyāḥ | paurṇavatsāḥ | āvaṭikāḥ | paramāvaṭikāḥ | hauṣyāḥ | dhauṣyāḥ | khāḍikāḥ | āhvarakāḥ | carakāḥ maitrāḥ | maitrāyaṇīyāḥ | hāritakarṇāḥ | śālāyanīyāḥ | marcakaṭhāḥ | prācyakaṭhāḥ | kapiṣṭhalakaṭhāḥ | upalāḥ | taittirīyāś ceti ||

There are twenty-four divisions of the Yajurveda, namely: the Kāṇvas, Mādhyaṃdinas, Jābālas, Śāpeyas, Śvetas, Śvetataras, Tāmrāyaṇīyas, Paurṇavatsas, Āvaṭikas, Paramāvaṭikas, Hauṣyas, Dhauṣyas, Khāḍikas, Āhvarakas, Carakas, Maitras, Maitrāyaṇīyas, Hāritakarṇas, Śālāyanīyas, Marcakaṭhas, Prācyakaṭhas, Kapiṣṭhalakaṭhas, Upalas, and Taittirīyas.