The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . only sphere of activity is in the water; the pterodactyle afTords an ex- I quadrupeds, which has no counterpart or correspondent group in the ample of a genus of flying reptiles, the fossil remains of which only j class of birds. Habit, or mode of life, has indeed nothing whatever have been discovered. Descending to lower groups, we find among to do with the physiological relations of organisms, which alTotd the birds, a genus of thrushes (CiRcis), which seek

- Image ID: 2AWJNHY
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . only sphere of activity is in the water; the pterodactyle afTords an ex- I quadrupeds, which has no counterpart or correspondent group in the ample of a genus of flying reptiles, the fossil remains of which only j class of birds. Habit, or mode of life, has indeed nothing whatever have been discovered. Descending to lower groups, we find among to do with the physiological relations of organisms, which alTotd the birds, a genus of thrushes (CiRcis), which seek
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Image ID: 2AWJNHY
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . only sphere of activity is in the water; the pterodactyle afTords an ex- I quadrupeds, which has no counterpart or correspondent group in the ample of a genus of flying reptiles, the fossil remains of which only j class of birds. Habit, or mode of life, has indeed nothing whatever have been discovered. Descending to lower groups, we find among to do with the physiological relations of organisms, which alTotd the birds, a genus of thrushes (CiRcis), which seeks its subsistence under only legitimate basis of classification -. and those special modifications water; and another of totipalmate water-fowl {Tnchj/petet), which to particular habits, which, occurring alike in any class, superinduce neither swims nor dives. Such deviations, however, from the general ! a resemblance in superficial characters only, constitute what has been character of their allied genera, have no intriusical relation to the I well distinguished by the term annliigy, as opposed to ajjiiiiti/.—Ko. MAMMALIANS. 39. riiey have all the upper jaw fixed to the skuII, and the lower composed of twopieces only, articulated by a projecting condyle to a fixed temporal bone; the neckconsists of seven vertebrae, one sinijle sjjecics excepted,which has nine*; the anterior ribs are attached infront, by cartilage, to a sternum formed of a certainnumber of pieces placed in a row; their fore-limbcommences in a blade-bone, which is not articulated,but merely suspended in the flesh, often resting onthe sternum by means of an intermediate bone, calleda clavicle. This extremity is continued by an arm, afore-arm, and a hand, tlie last composed of two rangesof small bones, called a wrist or carpus, of anotherrange of bones termed metacarpus, and of digits orfingers, eacli of which consists of two or three bones,named phalanges. Excepting the Cetacea, they have all the first part of

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