antarmātrāsamārūḍhaṃ bahīrūpatayādhyavasitaṃ sāṃvṛtamaṅkuśādikamālambya bāhye pravartanta ity arthaḥ /
The meaning is that [these notions] proceed toward external [objects] while depending upon goad etc., which are conventional, based on mere internal [content], and determined as having external form.