The affix añ (+\/- a) comes, in the sense of a primitive serviceable for a product after a word expressing the product of leather.,
The word चर्मणः in the aphorism is in the genitive case. This अञ् debars छ. Thus वार्द्ध्रं चर्म and वारत्रं चर्म a leather serviceable for making a 'vardhra' and 'varata' i.e. a leather thong.,