. On the anatomy of vertebrates [electronic resource] . thichnites or foot prints of the New-Ked Sandstones, for The lithographic slates of a latermezozoic period have revealed a true feathered bird,2 wantingonly the adaptive modification of the caudal vertebras charac-teristic of all neozoic birds, even those of the oldest tertiarystrata, in which fossil remains of representatives of nearly all thepresent orders of Aves have been The most recent in-stances of extinction of species are of the birds that have lost thepower of flight; as, , the gigantic Moas (Dinornis, Pala
. On the anatomy of vertebrates [electronic resource] . thichnites or foot prints of the New-Ked Sandstones, for The lithographic slates of a latermezozoic period have revealed a true feathered bird,2 wantingonly the adaptive modification of the caudal vertebras charac-teristic of all neozoic birds, even those of the oldest tertiarystrata, in which fossil remains of representatives of nearly all thepresent orders of Aves have been The most recent in-stances of extinction of species are of the birds that have lost thepower of flight; as, , the gigantic Moas (Dinornis, Palapteryx,Aptornis, CnemiornisY of New Zealand; the equally giganticEpyornis of Madagascar; the Dodo (Didus) of the Mauritius;the Solitaire (Pezophaps) of Rodriguez; the Gare-fowl (Alcaimpennis) of Northern shores or islands. Notwithstanding the characteristic powers of locomotion of theclass generally, it is amenable, most suggestively, to laws of geo-graphical distribution and limitation. 1 xvir. pp, 5 and 324. 2 xv. 3 cli*. and xvnr. p. 549. • XVI*.. 14 ANATOMY OF VERTEBRATES. CHAPTER XIV. OSSEOUS SYSTEM OF AVES. § 124. General Characters.—The skeleton of Birds is remark-able for the rapidity of its ossification and the light and elegantmechanism displayed in the adaptation of its several parts. Theosseous substance is compact, and exhibits more of the laminatedand less of the fibrous disposition than in the other vertebrateclasses. This is more especially the case in those parts of theskeleton which are permeated by the air. The bones which pre-sent this singular modification have a greater proportion of thephosphate of lime in their composition than is found in the osseoussystem of the mammalia, and they are whiter than the bones ofany other animal. In the bones where the medulla is not displacedby the extension of the air-cells into their interior, the colour is ofa duller white. In the Silk- or £ black-boned fowl of the Tropics( Gallus Morio, Temminck), the periosteal
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Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
