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With a nod of approbation to Lord Monboddo's theory, our author observes, that man has even the rudiments of "a caudal extremity" in the os coccygis. That the instinct of animals and the mind of man are the results of nothing but material organization is an obvious corollary from this doctrine.
The number of the caudal and sacral vertebrae vary; as does the number of the ribs, together with their relative breadth and the presence of processes. The size and shape of the apertures in the sternum are highly variable; so is the degree of divergence and relative size of the two arms of the furcula.
I couldn't stop marveling at these animals so perfectly cut out for racing, their heads small, their bodies sleek, spindle-shaped, and in some cases over three meters long, their pectoral fins gifted with remarkable strength, their caudal fins forked.
One horrible image, with its hideous heads and scaly caudal extremity, reminded me of the tremendous line of Milton, who, in speaking of the same evil dragon, describes him as "Swinging the scaly horrors of his folded tail." To an imaginative mind the scene was full of novel interest.
Morgan and her fellow workers, they took up the burden, determined to do their best. Yet, despite their great efforts, the class did not advance as other classes have done. Nor yet could it retrograde for it stood in a position where any backward movement was impossible. It was known throughout Exeter as the 'caudal appendage' class, being 'away back.
Carapace smooth, rather convex, and with three keels above; the beak, longly produced, ending in a spine, simple on the side and produced into a keel on each side behind; the central caudal lobe rather narrow, indistinctly divided in half, and like the other lobes flexile at the end, the lateral lobes with a central keel ending a slight spine; the hands elongated, compressed, smooth, with a thickened, toothed, inner margin, which is ciliated above; wrist with two conical spines on the inner side.
I said, placing my hand by the caudal feathers of our one specimen, and then slowly drawing it away till it was some distance off.
The largest the savage black howler is nearly two feet and a half in length of trunk; while the beautiful timid marmoset is so small that it may be inclosed in the two hands. Some have tails twice the length of their bodies; the caudal appendages of others appear to have been docked, or are altogether absent.
Carapace convex on the sides, rather rugose on the sides behind, the front only slightly produced and edged with a toothed raised margin not reaching beyond the front edge of the lower orbit, and with a very short ridge at the middle of each orbit behind; the hands compressed, rather rugose, edge thick and toothed: wrist with four or five conical spines on the inner side, the front the largest: the central caudal lobe, broad, continuous, calcareous to the tip, lateral lobes, with a very slight central keel; the sides of the second abdominal rings spinose.
And other changes had come while he lay and waited in the gravel. The embryonic fin which had made his tail so like a paddle was gone, the true dorsal and caudal and anal fins had taken their proper shape, and he looked a little less like a tadpole and a little more like a fish.
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