The affix ṅīṣ does not come in the feminine after a prātipadika (Nominal Stem) denoting a part of the body when the word is subordinate in a compound, preceded by the word 1. saha 'with' 2. nañ 'not' or 3. vidyamāna 'having'.,
Thus सकेशा, अकेशा विद्यमानकेशा ॥ So also सनासिका अनासिका or विद्यमाननासिका ॥ The last example shows, that the present rule governs also 4.1.55 ante: as well as 4.1.54.,