The Khilani are a collection of 98 "apocryphal" hymns of the Rigveda, recorded in the ', but not in the ' shakha. They are late additions to the text of the Rigveda, but still belong to the "Mantra" period of Vedic Sanskrit.
Literature
Isidor Scheftelowitz, Die Apokryphen des Rgveda, Breslau, 1906