. Bulletin of the British Museum (Natural History), Geology. 328 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES The postorbito-infraorbital (lacrymo-jugal) is a complete bar beneath the orbit similar in shape to that in Holophagus acutidens. Anteriorly it articulates with the supraorbital and the antorbital. The arrangement of the postorbitals and other cheek plates is somewhat different from that figured by Reis (1892a, fig. 1) for Holophagus acutidens, and also different from that figured by Woodward (1891, fig. 53) for Holophagus gulo itself. Fitting neatly beneath the posterior corner o
. Bulletin of the British Museum (Natural History), Geology. 328 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES The postorbito-infraorbital (lacrymo-jugal) is a complete bar beneath the orbit similar in shape to that in Holophagus acutidens. Anteriorly it articulates with the supraorbital and the antorbital. The arrangement of the postorbitals and other cheek plates is somewhat different from that figured by Reis (1892a, fig. 1) for Holophagus acutidens, and also different from that figured by Woodward (1891, fig. 53) for Holophagus gulo itself. Fitting neatly beneath the posterior corner of the postorbito-infraorbital and covering the quadrate is a triangular-shaped bone, tapered anteriorly. This is homologous to the preoperculoquadratojugal of Stensio (1937 : 12), and the preopercular of Moy- Thomas (1937 : 387). Above this bone and articulating with both it and the Pa + Dpt Op \. Sop 20 mm \ Sp \ \ \ Pal+Ectpt Cor Ang Gu Pt painf Psph Fig. 55. Holophagus gulo Egerton. Reconstruction of the skull and pectoral girdle. postorbito-infraorbital is a somewhat larger bone, the preoperculo-postorbital. Between the preoperculo-postorbital and the parieto-dermopterotic is a postorbital bone, smaller than the other two cheek plates, and articulating with the first supraorbital. Behind the cheek plates is a large, roughly triangular-shaped opercular, well shown in P 3344. Beneath the opercular are traces of another small bone, presumably equivalent to the suboperculum of Reis (1892a, fig. 1). There is no evidence of a sclerotic ring, although this is present in the closely related Holophagus acutidens. Lower jaw. In medial view the major portion of the lower jaw can be seen to consist of one bone, the angular (Text-fig. 56). This bone is continuous near its. 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 r
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