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Updated: May 8, 2025
Then come the mollusca, which include the oysters, clams and other shell-fish; snails, cuttle-fish, sea-squirts, etc. All of the above families of animal-forms are what are known as "invertebrates," that is, without a backbone. Then we come to the "vertebrates," or animals having a backbone. First we see the fish family with its thousands of forms.
Remember the remark of Darwin, that the brain of the ant, although not much larger than a pin point, "is one of the most marvelous atoms of matter in the world, perhaps more so than the brain of man." Closely allied to the crustacea is the sub-family of the mollusca, which includes the oyster, clams, and similar creatures; also the snails, cuttle-fish, slugs, nautilus, sea-squirts, etc., etc.
Or it may be that the whelk has chosen this quiet nook to deposit her leathery eggs; or young barnacles, periwinkles, and limpets are growing up among the green and brown tangles, while the far-sailing velella and the stay-at-home sea-squirts, together with a variety of other sea-animals, find a nursery and shelter in their youth in this quiet harbor of rest.
Strange as it may appear at first sight, some of the higher forms of the mollusca show signs of a rudimentary vertebra, and science has hazarded the opinion that the sea-squirts and similar creatures were descended from some ancestor from whom also descended the vertebrate animals, of which man is the highest form known today on this planet.
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