With reference to Professor Keith's statement in BSOS., Vol. V, Pt. I, pp. 27 ff., that the Durghaṭa referred to by Sarvānanda in the Ṭikāsarvasva is the well-known Durghaṭa-vṛtti of Śaraṇa-deva, it may be pointed out that Sarvānanda clearly states in the same passage that Puruṣottama-deva is the author of the work in question: Puruṣottama-devena gurviṇītyasya durghaṭe’sādhutvam uktam. This passage has been quoted in full by Professor Keith himself, but he has apparently missed or ignored the name of the author. The Puruṣottamadeva of Sarvānanda's citation in this passage is apparently the grammarian Puruṣottama-deva. But it is not known to us whether this Puruṣottama wrote a book on durghaṭa also. But Rāyamukuṭa (Dacca University MSS. No. 985), while explaining the same word gurviṇī, refers to one Uṇādi-vṛtti by Puruṣottama: (gurviṇityuṇādivṛttau Puruṣottamaḥ). Puruṣottama-deva, however, is known to have written an Uṇādi-sūtra-vṛtti, which, as mentioned by Aufrecht (Catalogus Catalogorum, vol. i, p. 63a), is quoted by Ujjvala-datta.