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On the other hand, existing reptiles have no feathers. They may have naked skins, or be covered with horny scales, or bony plates, or with both. They possess no wings; they neither fly by means of their fore-limbs, nor habitually walk upright upon their hind-limbs; and the bones of their legs present no such modifications as we find in birds.

Maybe he turned, as a man attacked by a dog does, because he felt, in a cold, nervy sort of spasm all up his spine, the terrible defenselessness of his hind-limbs. And as he turned, he struck bat-bat! struck with all his talons unsheathed; struck with every ounce and grain of power, and force of brain to back that power, in his system; struck as only a cornered cat can strike; struck like a lion.

The colour of the skin is a dusky lead, with some flesh-coloured marks on the belly, and the skin itself is an inch thick at its thickest part, on the back. Beneath the skin is a layer of fat, of great, thickness, which makes excellent oil when boiled. As we have said, the manati has no appearance of hind-limbs. Its fore-limbs, however, are highly developed for a water animal.

It is usually about seven feet in length, and five round the thickest part of the body, which latter is quite smooth, and tapers off into a horizontal flat tail, semicircular in shape. There are no hind-limbs upon the animal, but just behind the head are two powerful fins of an oval shape.

It is generally about seven or eight feet long, though it attains a length of ten feet or more, and nine feet and upwards in girth. On the upper part the body is perfectly smooth, and of a lead colour. It tapers off towards the tail, which is flat, horizontal, and semicircular, without any appearance of hind-limbs.

It was on account of this peculiarity that the great French naturalist Cuvier named the whole group of monkeys Quadrumana, or four-handed animals, because, besides the two hands on their fore-limbs, they have also two hands in place of feet on their hind-limbs.

The colour of the skin is a dusky lead, with some flesh-coloured marks on the belly, and the skin itself is an inch thick at its thickest part, on the back. Beneath the skin is a layer of fat, of great thickness, which makes excellent oil when boiled. As we have said, the manati has no appearance of hind-limbs. Its fore-limbs, however, are highly developed for a water animal.

When hard-pressed, however, the knowing little animal, finding no bough round which to coil its tail, rears itself up on its hind-limbs, and balances itself by curling up its tail in the form of the letter S, as high as its head; thus by altering the centre of gravity being enabled to got over the ground in a posture such as no other member of its tribe can maintain.

In one the pyxis the plastron is furnished with a transverse hinge, so that the animal can retract its head and fore-limbs within the carapace, and close the plastron upon it, first shutting them in. In another the kinixis the carapace has the posterior portion distinct from the anterior, and movable, so as to shield the hind-limbs and tail.

A comparison of the hind-limbs of birds with those of bats and pterodactyls suggests strongly that the patagium flyers have arisen from arboreal or climbing animals, while the birds arose from terrestrial forms which acquired the bipedal habit, as certain reptiles have. An arboreal animal would necessarily use all four limbs, as climbing animals actually do.