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Show 320 ON THE OSTEOLOGY OF THE FALCONIFORMES. [Apr. 15. PLATE XXXII. Fig. 1. Dorsal aspect of skull of Catharistes urubu, showing the absence of processes to the lachrymals and the imperfect nasal hinge. Fig. 2. Dorsal aspect of skull of Serpentarius serpentarius, showing the large orbital processes of the lachrymals and their relation to the frontals. Fig. 3. Dorsal aspect of the skull of Buteo jakal, showing the large, outstanding orbital processes and the superciliary plate. Fig. 4. Dorsal aspect of the skull of Falco minor, showing the large outstanding orbital processes of the lachrymal and the absence of a superciliary plate. Fig. 5. Dorsal aspect of the skull of Pandion haliaetus, showing the absence of orbital processes to the lachrymal. Compare this fig. with the skull of Catharistes, fig. 1, and note that in Pandion the lachrymal appears on the surface of the skull. Fig. 6. Dorsal aspect of the skull of Microhierax, to show the nasal hinge. Fig. 7. Lateral aspect of the skull of Microhierax fringillarius, to show the nasal hinge. Fig. 8. Lateral aspect of the skull of Falco minor, to show the relation of the lachrymal to the antorbital plate (prefrontal) and the shape of the nostril. Fig. 9. Lateral aspect of the lachrymo-nasal region of Pandion haliaetus, to show the fusion of the lachrymal with the antorbital plate. Fig. 10. Lateral aspect of the lachrymo-nasal region of Serpentarius serpentarius, to show the relation of the lachrymal to the antorbital plate, and the great size of the antrua.mp .o f Highinore. 1. n.h. s. or.1. = antorbital plate. = lachrymal. = nasal hinge. = superciliary plate. = orbital process of lachrymal. PLATE XXXIII. Fig. 1. Lateral view of the upper jaw of Hierofalco gyrfalco, showing the gradual suppression of the vertical bullate portion of the maxillo-palatine by the increasing development of the anterior olfactory chamber (vestibulum externus). Fig. 2. Lateral view of the upper jaw of Harpa australis, showing the more primitive condition of the vertical bullate portion of the maxillo-palatines in the Falconina. Fig. 3. Lateral view of the upper jaw of Milvago chimachima, showing the more primitive condition of the bullate portion of the maxillo-palatines in the Polyborina. Fig. 4. Lateral view of the upper jaw of Herpetotheres cachinnans, showing the maximum development of the bullate portion of the maxillo-palatines reached by the Falconinm. Fig. 5. Lateral view of the upper jaw of Ibycter ater, showing the m a x i m um development of the bullate portion of the maxillo-palatines reached by the Falconinm. Fig. 6. Dorsal aspect of the palatal bones of a young Pernis apivorus, to show the hemipterygoids. Fig. 7. Lateral view of the palatal bones of a young Pernis apivorus, to show the relation of the hemipterygoid to the vomer. Fig. 8. Lateral view of the lachrymo-nasal region of the skull of Psophia, after removal of the lachrymal and part of nasal, to show the septo-maxillary spurs and their relation to the maxillo-palatines and nasal septum. h.pt. = hemipterygoid. mx.p. = maxillo-palatine. n.s. = nasal septum. v.e. = vestibulum externus. vo. = vomer. |
