Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Crīsa, ae, f., = Κρῖσα, an ancient town of Phocis, on the sea, now Crisso, Plin. 4, 3, 4, § 8.
Hence, adj.: Crīsaeus, a, um, of Crisa: sinus = κόλπος Κρισαῖος, Plin. 4, 3, 4, § 7.