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In the great class of the Crustacea, forms wonderfully distinct from each other, namely, suctorial parasites, cirripedes, entomostraca, and even the malacostraca, appear at first as larvae under the nauplius-form; and as these larvae live and feed in the open sea, and are not adapted for any peculiar habits of life, and from other reasons assigned by Fritz Muller, it is probable that at some very remote period an independent adult animal, resembling the Nauplius, existed, and subsequently produced, along several divergent lines of descent, the above-named great Crustacean groups.
He had kicked off his deer-skin socks, and stood bare-footed on the cold and draughty floor, while the poison he had imbibed showed only in his heated face, Silently he extended a cracked and hardened hand, which closed like the armoured claw of a crustacean and tightened on the crunching fingers of the other.
They needed to be light, and in order to be so had dispensed with the rigid and hard shell of the crustacean that prevents motion, preferring the coat of mail covered with scales, which expands and contracts, yields to the blow but is not injured.
Practically all animals having a heavy calcareous shell were grouped with the snails and oysters as mollusks. But the barnacle did not fit well with other mollusks. Its shell was entirely different. It had several pairs of legs; and no mollusk has legs. The barnacle is evidently a sessile crab or better crustacean.
If the raven fails he turns the shell over and over until the impatient crustacean allows a claw to emerge; he is then seized and immediately devoured. Huber, Nouvelles Observations sur les Abeilles, t. ii. p. 291. If there is a question of hunting larger game like a Hare, the Raven prefers to take an ally. They start him at his burrow and pursue him flying.
The fish had already been developed, and the Devonian rocks show it swarming, in great numbers and variety, in the enclosed seas and round the fringe of the continents. The first generation was a group of strange creatures, half fish and half Crustacean, which are known as the Ostracoderms. The hind-part of their bodies was remarkably fish-like in structure.
The fossil records of the long ages during which the Mollusc, the Crustacean, and the Echinoderm slowly assumed their characteristic forms are hopelessly lost. But we are now prepared to return to the record which survives, and we shall find the remaining story of the earth a very ample and interesting chronicle of evolution.
Then bread and butter and salad were found to be very refreshing. But while Daisy eat, she looked at the trilobite. "Please tell me what it is, Capt, Drummond." "It is a Crustacean." "But you know I don't know what a Crustacean is." "A Crustacean, is a fellow who wears his bones on the outside." "Capt. Drummond! What do you mean?" "Well I mean that, Daisy.
Probably the rarity which fell into Hamed's hands was the pearly presentment of a crustacean, for marine frogs are infinitely rarer than pearls. Several molluscs admit tenants, one particular species a rotund crab; but in the case in point the wrong mansion was entered and, so to speak, the obtruder was transformed.
Kinahan in Wicklow, and an obscure crustacean form, Palaeopyge Ramsayi, they were supposed to be barren of organic remains. Now, however, through the labours of Mr. Hicks, they have yielded at St. David's a rich fauna of trilobites, brachiopods, phyllopods, and pteropods, showing, together with other fossils, a by no means low state of organisation at this early period.
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