The common frog . Fig. 34.—The Atlas VerteHra of Man. s, rudiment of neural spine ; d. tubercularprocess; /, capitular process ; a, articular surface for skul ; hy, plate of boaeholding the pbce oi a craaium, and articulating with the odontoid process ofthe axis vertebra. the axis, and provided with a toothlike [odontoidYprocess, round which, as round a pivot, the atlas works. Nothing of the kind exists in any Fig 35.—Lateral, Dorsal, and Vencial view of first Vertebra of Ampkiutna. In the frog (and in all its class) we find but a singlevertebra representing these two, but in some allie
The common frog . Fig. 34.—The Atlas VerteHra of Man. s, rudiment of neural spine ; d. tubercularprocess; /, capitular process ; a, articular surface for skul ; hy, plate of boaeholding the pbce oi a craaium, and articulating with the odontoid process ofthe axis vertebra. the axis, and provided with a toothlike [odontoidYprocess, round which, as round a pivot, the atlas works. Nothing of the kind exists in any Fig 35.—Lateral, Dorsal, and Vencial view of first Vertebra of Ampkiutna. In the frog (and in all its class) we find but a singlevertebra representing these two, but in some alliedforms, in Amphiiinia, this vertebra develops a ^ From f Sot/s, a tooth, and HZos, form. 70 THE COMMON FROG. [chap. median process, reminding us of the odontoid pro-cess of the axis. The frog, as has been said, has no ribs, in spite ofthe long transverse processes which project out oneach side of the backbone. Ribs are not necessaryto it, for it could apply them to none of the purposesto which ribs are ever applied. In all beasts ribs aid importantly in respiration,serving by their motions alternately to inflate orempty the lungs by enlarging or contracting thecavity of the chest in the way before frog, however, breathes exclusively, as regardsthe lungs, by swallozving air by a mechanism whichwill be described shortly. In serpents the ribs are the organs of locomotion,as also in the Flyi
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
