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Updated: May 15, 2025
A more interesting animal is the Ctenomys magellanica, a little less than the rat in size, with a shorter tail, pale grey fur, and red incisors. It is called tuco-tuco from its voice, and oculto from its habits; for it is a dweller underground, and requires a loose, sandy soil in which, like the mole, it may swim beneath the surface.
The profile of the incisors, viewed from the side, is quite angular. The dental stars are prominent. NINETEEN YEARS. All of the signs of the seventeen-year-old mouth are more prominent. The cups have usually disappeared from the upper incisors. Name the different kinds of teeth; state the arrangement and number. How is the age of an animal determined?
Hence the form of dentition in man is very important. In the fully developed condition we have thirty-two teeth; of these eight are incisors, four canine, and twenty molars. The eight incisors, in the middle of the jaws, have certain characteristic differences above and below. In the upper jaw the inner incisors are larger than the outer; in the lower jaw the inner are the smaller.
The navicular and the cuboid unite, and the distal end of the fibula is ankylosed with the tibia. In Cainotherium and Dichobune the upper incisors are fully developed. There are seven grinders; the teeth form a continuous series without a diastema. The metatarsals, the navicular and cuboid, and the distal end of the fibula, remain free.
Thus camels, guanacoes, chevrotains, and musk-deer, are hornless, and they have efficient canines; these teeth being "always of smaller size in the females than in the males." The Camelidae have, in addition to their true canines, a pair of canine-shaped incisors in their upper jaws.
In fear of yielding to the temptation, I was thinking of giving the signal for departure, when it became evident that the animals whose games were enlivening us were actuated by a sudden panic. All the moles, which were solemnly seated, nodded to and fro their enormous heads, showing their long yellow incisors, and seemed to sniff the air. Suddenly they all rushed towards their burrows.
Our Kayans from Kaburau had no less than ten teeth filed off, the four incisors and three more on either side. The operation is performed when a boy or girl becomes full-grown. For the boys it is not a painful experience, but the girls have theirs filed much shorter, which causes pain and loss of blood. The Punans make fire by iron and flint which are carried in a small bamboo box.
Thus the crowns of the cutting teeth have a peculiar deep pit, which gives rise to the well-known "mark" of the horse. There is a large space between the outer incisors and the front grinders. In this space the adult male horse presents, near the incisors on each side, above and below, a canine or "tush," which is commonly absent in mares.
When they found that he would not eat the coarse food which they did, they brought him other things; and they invariably allowed him to drink first at the pools." "Well, that was homage to our superiority. Confound their quahs, I shall not get them out of my head for a week. What terrible large tusks they have!" "Yes, their incisors are very strong.
In this section the earth is many-mouthed with caves and cut with passages running from cave to cave, so that the inhabitants may go and come hidden from sight. Jawbone and Hairyman and Lowbrow, of the Stone Age, would be at home there, squatting on their hunkers and tearing at their raw kill with their long incisors.
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