LITERATURE CITED
American Ornithologists' Union
1957. Check-List of North American birds. Baltimore, Maryland, Amer. Ornith. Union, xiv + 691 pp.
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1941. A study of the structure of the humerus in the Corvidae. Condor, 43:184-195.
Beddard, F. E.
1898. The structure and classification of birds. London, Longmans, Green, & Co., xx + 548 pp.
Berger, A. J.
1956. Anatomical variation and avian anatomy. Condor, 58:433-441.
Bhaduri, J. L., and Biswas, B.
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Bhaduri, J. L., Biswas, B., and Das, S. K.
1957. The arterial system of the domestic pigeon (Columba livia Gmelin). Anat. Anz., 104:1-14.
Coues, E.
1903. Key to North American birds. Vol. I, Fifth edit. Boston, The Page Company, xlii + 535 + [55] pp.
Fisher, H. I.
1955. Major arteries near the heart in the Whooping Crane. Condor, 57:286-289.
Glenny, F. H.
1940. The main arteries in the region of the heart of three species of doves. Bull. Fan Mem. Inst. Biol., Zool. ser., vol. 10, pt. 4, 271-278. (Not seen.)
1955. Modifications of pattern in the aortic arch system of birds and their phylogenetic significance. Proc. U. S. Nat. Mus., 104:525-621.
Howard, H.
1929. The avifauna of Emeryville Shellmound. Univ. Calif. Publs. Zool., 32:301-394.
Howell, A. B.
1937. Morphogenesis of the shoulder architecture: Aves. Auk, 54:364-375.
Hudson, G. E., and Lanzillotti, P. J.
1955. Gross anatomy of the wing muscles in the family Corvidae. Amer. Midl. Nat., 53:1-44.
Mayr, E.
1955. Comments on some recent studies of song bird phylogeny. Wilson Bull., 67:33-44.
Mayr, E., Linsley, E. G., and Usinger, R. L.
1953. Methods and principles of systematic zoology. New York, McGraw-Hill Book Co., x + 336 pp.
Simpson, G. G.
1961. Principles of animal taxonomy. New York, Columbia Univ. Press, xiv + 247 pp.