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Show 56 ON THE OSTEOLOGY OF THE EURYLiEMIDyE. [May 2, But this point, as well as the status of the " Passeres Clamatores, I pi'opose to deal with in a further communication at no distant date. xi. L ist o f L iterature r e f e r r e d t o . (1) B eddard, F. E.-The Structure and Classification of Birds. (2) F orbes, W . A.-" Contributions to the Anatomy of Passerine Birds." Parts II., III. P. Z. S. 1880. (3) F urbringer, M.- 4‘ Zur vergleich. Anat. des Brustschultes-apparates." Jenaisch. Zeitschr. f. Naturwiss. xxxvi. 1902. (4) G adow, H .- Bronn's Thier-Reich. Systemat. Theil, Band vi. Vogel. 1893. (5) G arrod, A. H.- " On some Anatomical Characters which bear upon the Major Divisions of the Passerine Birds." Part I. P. Z. S. 1876. (6) M itchell, P. C.- " On the Anatomy of Gruiform Birds." P. Z. S. 1901, vol. ii. p. 629. (7) Sharpe, R. B.-A Review of Recent Attempts to Classify Birds. 1891. xii. E X P L A N A T IO N OF PLATE I I . Fig. 1. Inner aspect of skull of nestling Enryleemus showing the large area occupied by the squamosal. 1 a. Outer view of same skull showing the peculiar form of the squamosal. 2. Side view of Calyptomena viridis showing the peculiar lachrymal, large narial aperture, and large and spongy antorbital process. 2 a. Ventral view of same skull to show the vomer, maxillo-palatine processes, and wide-set palatines. 2 I). Dorsal aspect of same skull to show the large size of the nasal fossa and the nasal hinge. 3. Ventral aspect of skull of Cymbirhynchus showing the slender maxillo-palatine processes, short vomer, and sharply bent palatines. Note the difference between the palatal surface of this species and that of Calyptomena. 3 a. Dorsal aspect of same skull to show the closing in of the nasal fossa and the formation of pseudo-nasal apertures. 4. Dorsal aspect of the skull of Corydon to show the large size of the narial apertures and nasal hinge. Explanation o f Letters. a.o.p. = antorbital process. als. = alisphenoid. a.p.v. = anterior palatine vacuity. b.oc. - basi-occipital. b.s. = basisphenoid. ex. = exoccipital. f r . = frontal. Ji.pt. = hemipterygoid. I. = lachrymal. mes. = mesethmoid. mx.p. = maxillo-palatine. na. = nasal. n.h. = nasal hinge. p. = parietal. pa. = palatine. p.na. = posterior nares. p.o.p. = postorbital process. pro. - prootic. pt. = pterygoid. s.n. = septum nasi. sq. =■ squamosal. v. = vomer. |