. Bulletin of the British Ornithologists' Club. [Bull. 1978: 98(1)] 6 restricted to the cranial wall and there is no opening in the septum; this is the condition found in all Carduelinae and in some members of the Emberi- zinae, Cardinalinae, Drepanididae, Estrildidae and Ploceidae. In the Fringil- linae, Icteridae, Thraupinae, and some members of the other groups (except Carduelinae) the bony septum is incomplete because of forward intrusion of. Figure 1. Skulls of finches showing differences in interorbital septa. A, Passer domesticus; B, Spi^ellapusilla; C, Carduelis tristis. CF, cra
. Bulletin of the British Ornithologists' Club. [Bull. 1978: 98(1)] 6 restricted to the cranial wall and there is no opening in the septum; this is the condition found in all Carduelinae and in some members of the Emberi- zinae, Cardinalinae, Drepanididae, Estrildidae and Ploceidae. In the Fringil- linae, Icteridae, Thraupinae, and some members of the other groups (except Carduelinae) the bony septum is incomplete because of forward intrusion of. Figure 1. Skulls of finches showing differences in interorbital septa. A, Passer domesticus; B, Spi^ellapusilla; C, Carduelis tristis. CF, cranial fenestra; E, ectethmoid; IF, interorbital fenestra; OF, optic foramen; IS, interorbital septum. OF C F. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : British Ornithologists' Club
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