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Skull of Perch with the Operculum removed, to show the bones of the head, the branchial arches, and the branchi-ostegal rays
1, Frontal; 2, pre-frontal; 3, post-frontal; 4, epiotic; 5, supra-occipital; 6, basi-occipital; 7, ex-occipital; 9, vomer; 10, para-sphenoid; ll, nasal; 12, all-sphenoid; 13, orbito-sphenoid; 15, petrosal; 17, pre-maxillary; 18, maxillary; 19, dentary and articular elements of mandible; 20, hyo-mandibular; 21, quadrate; 22, metapterygoid; 23, pterygoid; 24, ento-pterygoid; 25, palatine; 26, sympletic; 27, operculum; 28, pre-operculum; 29, sub-operculum; 30, inter-operculum behind the gill rakers; 31, stylo-hyal; 32, epi-hyal, eratohyal, and basi-hyal; 33, glosso-hyal; 34, branchi-ostegal rays; 35, bons of the branchial arches; 36, uro-hyal

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