. The natural history of birds . h is the principal one ofthis class. They have the sternum elongated, varying inbreadth, narrower in the middle than at the extre-niities. The sternal keel is well developed, but 406 STERNUM OF THE POCHARD. usually lower than the ^ndth of half the lower edge of the keel is sometimes convex,sometimes straight, and the anterior one generallyconcave, and in some of the species there is a cavityat the base of the crest, in which a duplicature of thetrachea is lodged. The coracoids are never verylong; they are large at their bases, and rather firmlyattac
. The natural history of birds . h is the principal one ofthis class. They have the sternum elongated, varying inbreadth, narrower in the middle than at the extre-niities. The sternal keel is well developed, but 406 STERNUM OF THE POCHARD. usually lower than the ^ndth of half the lower edge of the keel is sometimes convex,sometimes straight, and the anterior one generallyconcave, and in some of the species there is a cavityat the base of the crest, in which a duplicature of thetrachea is lodged. The coracoids are never verylong; they are large at their bases, and rather firmlyattached to the sternum. There are seven or eight ribs (in some cases nine)on each side of the sternum, and the posterior part ofthat bone is generally divided by notches, though theheads of the processes are so much produced as nearlyto meet each other. The clavicle is of moderatelength, and well arched, and the shoulder bones ratherslender, and arched through the whole extent. Thegeneral character is that of having the bones of the.
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Keywords: ., bookcentury1800, bookidnaturalhistoryof00mudi, booksubjectbirds
