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Updated: May 3, 2025
The body is easily bent, owing to the soft hinges between the hard rings. But the coat itself will not stretch. Then how do these little creatures grow? We see small Shrimps and large ones, so grow they must, in some way. They are of the same family the crustacea as the crab; and they grow in much the same way. The hard covering gets too tight for the body inside it.
Apart from the appearance of the great fishes and Crustacea, the Carboniferous period was one of great stimulation to aquatic life. Constant changes were taking place in the level and the distribution of land and water. The aspect of our coal seams to-day, alternating between thick layers of sand and mud, shows a remarkable oscillation of the land.
Bartlett, on courting of Argus pheasant. Bartram, on the courtship of the male alligator. Basque language, highly artificial. Bate, C.S., on the superior activity of male crustacea; on the proportions of the sexes in crabs; on the chelae of crustacea; on the relative size of the sexes in crustacea; on the colours of crustacea.
In the sea around Tierra del Fuego, and at no great distance from the land, I have seen narrow lines of water of a bright red colour, from the number of crustacea, which somewhat resemble in form large prawns. The sealers call them whale-food.
Thus, in my eyes, this point long constituted one of the chief difficulties in the application of the Darwinian views to the Crustacea, and I could scarcely venture to hope that I might yet find traces of this passage through the Zoea-form among the Amphipoda or Isopoda, and thus obtain a positive proof of the correctness of this conclusion.
"Why, he has got one; he has indeed!" shouted Bouldon, as Gregson produced, by the antennae, a crayfish, which, to prevent himself from being bitten, he caught by the back; its claws, though they stretched wide open, as if they had the cramp very badly, being utterly harmless. "This is a Crustacea," cried Gregson, holding him up in pride; "and if not a lobster, it may well be called one.
As the authors who have asserted the complete subordination of the brain to the instincts in woman, have thus, perhaps unconsciously, reduced her to the anatomical level of the crustacea; so those who, like Dr.
Cryptogamic vegetation would have the advantage over Phanerogamic; Hydrozoa over Corals; Crustacea over Insecta, and Amphipoda and Isopoda over the higher Crustacea; Cetaceans and Seals over the Primates; the civilization of the Esquimaux over that of the European.
Numerous examples, which might easily be augmented, of such profound differences, are furnished by Leydig's 'Lehrbuch der Histologie. In the Crustacea the ovarian eggs actually sometimes furnish excellent characters for the discrimination of species of the same genus; thus, for example, in one Porcellana of this country they are blackish-green, in a second deep blood-red, and in a third dark yellow; and within the limits of the same order they present considerable differences in size, which, as Van Beneden and Claus have already pointed out, stands in intimate connexion with the subsequent mode of development.
When, on the other hand, we look around in palæontology, the oldest fossil fishes remind us neither of the crustacea nor of the ringed worms, but of the crabs: a class of animals which lies entirely outside of Häckel's stem-line of vertebrates. Also the first appearance of mammalia does not show transitions.
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