. Natural history. For the use of schools and families. Zoology. MOLLUSKS. 323. Fig. 254.—Clio Borealia. with teeth, calculated to tear in pieces the minute ani- mals on which it feeds. It has also a very effective ap- paratus for securing its prey, consisting of six tentacnla of a reddish color. On examining one of these with a microscope, this color is found to be occasioned by red points arranged with great regularity. On magnifying these still farther, each point is seen to be a collection of about twenty suckers on the ends of as many stalks. Each collection is in a sort of sheath, and ca
. Natural history. For the use of schools and families. Zoology. MOLLUSKS. 323. Fig. 254.—Clio Borealia. with teeth, calculated to tear in pieces the minute ani- mals on which it feeds. It has also a very effective ap- paratus for securing its prey, consisting of six tentacnla of a reddish color. On examining one of these with a microscope, this color is found to be occasioned by red points arranged with great regularity. On magnifying these still farther, each point is seen to be a collection of about twenty suckers on the ends of as many stalks. Each collection is in a sort of sheath, and can be pro- truded from it. There are on all the tentacula about three hundred and sixty thousand of these suckers, con- stituting an apparatus for prehension more extensive, in proportion to the size of the animal, than any other to be found in the whole animal kingdom. Questions.—What is the significance of the name of the third sub- kingdom of animals ? What are naked Mollusks? What is said of the use of the covering which most of them have ? Of what is it composed? What is said of the proportions of the constituents? How is the shell formed? What are the two kinds of shells? What is said of the changes which shells undergo in growing? What is said of the locomotion of MoUucks ? What is said of the foot, and its various uses? What is the byssus? What provision for locomotion is there in most of the Mollusks that inhabit bivalve shells ? What in those that are similar in structure, but have no shell? What is ihe sjiccial destiny of Mollusks? What is said of their breathing apparatus? What of their blood, and its circulatiou ? What arc the two grand divisions of Mollusks ? What are the groups in the first division, and their characteristics? Of the Ccphiilopods, what shelly species exist at the present time? What is said of the Ammonites? Describe the Etructui-e and habits of the Cuttle-fish. What is sepia? What. Please note that these images are extracted from scanned page
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