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Updated: May 31, 2025
Of such plans or structural conceptions Cuvier found in the whole animal kingdom only four, which he called Vertebrates, Mollusks, Articulates, and Radiates.
To that, doubtless, it may be said that in its etymological acceptation, entomology is that part of the natural sciences which includes all the articulates. That is true, in a general way; but it is the custom to give this word a more restricted sense.
And in order to complete his study of marine articulates, he needed to mention the class Cirripedia, which contains water fleas and carp lice, plus the class Annelida, which he would have divided without fail into tubifex worms and dorsibranchian worms. But having gone past the shallows of the Strait of Sicily, the Nautilus resumed its usual deep-water speed.
I should add, however, that many impressions described as produced by Worms are more likely to have been the tracks of Crustacea. But by far the most characteristic class of Articulates in ancient times were the Crustaceans. The Trilobites stand in the same relation to the modern Crustacea as the Crinoids do to the modern Echinoderms.
"Hold!" said Captain Hull. "That is whales' food. Mr. Benedict, a fine occasion to study this curious species of crustacea." "Phew!" from the entomologist. "How phew!" cried the captain. "But you have no right to profess such indifference. These crustaceans form one of the six classes of the articulates, if I am not mistaken, and as such " "Phew!" said Cousin Benedict again, shaking his lead.
The superior extremity of the tibia shows a central spine margined laterally by rather plain articular faces. It articulates with the thigh bone. The muscles of this region are divided into two sub-regions, anterior and posterior tibial.
Thus the sponges are later than the protozoa, the corals succeed the sponges, the sea-urchins come after the corals, the shell-fish follow the sea-urchins, the articulates are later than the shell-fish, the vertebrates are later than the articulates.
Conseil kept especially busy observing mollusks and articulates, and although his catalog is a little dry, I wouldn't want to wrong the gallant lad by leaving out his personal observations.
Sometimes the solitary calls on himself to break this oppressive and painful silence; he articulates a few words aloud, and his voice inspires him with fear; it seems formidable and unnatural.
The Introduction presents, as it were, the prelude to this vast chapter of natural history in the simultaneous appearance of the four great types of the animal kingdom: Radiates, Mollusks, Articulates, and Vertebrates. Then comes the orderly development of the class by which the vertebrate plan was first expressed, namely, the fishes.
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