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View in the horizontal plane of the teeth of the left half of the lower and the left half of the upper jaw of the Coypu rat to show the single great gnawing incisor on each side, the four flat grinding molars and the wide gap between molars and incisors.
Up to five years, the age of a sheep can always be determined by the incisor teeth; a yearling has but two permanent incisors, a two-year-old four, a three-year-old six, and a four-year-old or over eight teeth, or a full set. It was unpleasantly cold upon the mountains this day, and as no other sheep could be seen, we returned to camp by five o'clock.
FIFTEEN YEARS. The angle with which the teeth meet is greater than at twelve, the teeth are smaller and dental stars are represented by dark round spots in all of the inferior incisors. The tables of the nippers and dividers are triangular. SEVENTEEN YEARS. All of the tables of the lower incisor teeth are triangular. The teeth are narrower and smaller than at fifteen.
Moreover, in the least modified mammals, the total number of the teeth is very generally forty-four, while in horses, the usual number is forty, and in the absence of the canines, it may be reduced to thirty-six; the incisor teeth are devoid of the fold seen in those of the horse: the grinders regularly diminish in size from the middle of the series to its front end; while their crowns are short, early attain their full length, and exhibit simple ridges or tubercles, in place of the complex foldings of the horse's grinders.
The mule's mouth undergoes exactly the same changes as the horse's. Between the ages of two and three these changes begin to take place in the mule's mouth. The front incisor teeth, two above and two below, are replaced by the horse for permanent teeth. These teeth are larger than the others, have two grooves in the outer converse surface, and the mark is long, narrow, deep, and black.
Temporary Teeth Permanent Teeth Incisors Canines Molars Incisors Canines Molars Solipeds 12 12 12 4 24 Ox 8 12 8 0 24 Sheep 8 12 8 0 24 Hog 12 12 12 4 24 The tusks or canine teeth are not always present in the female. Ruminants do not have upper incisor teeth. The temporary teeth are erupted either before or within a few days to a few months after birth.
It had a blunt muzzle, with the eyes set high in the head; was destitute of a tail; and its toes were so united as to enable it to swim with ease. It was of a blackish grey hue, with rather long hairs, of a yellow tinge, falling thickly over the body. The doctor exhibited its head, which contained enormous incisor teeth, and curiously-formed molars.
Something he saw there made him start back with a stifled exclamation. "What is it?" cried the girl, startled. "Tell me!" But he, realizing the nature of his discovery for he had seen a human incisor tooth, gold-filled, there in the odd little heap straightened up quickly and assumed to smile. "It's nothing, nothing at all!" he answered. "Come, we haven't got any time to waste.
That portion of the superior maxillary bone which lies between the sockets of the eye-teeth protruded, with the sockets, to a remarkable degree, and instead of being curved, appeared to be quite straight. The incisor teeth were very large and white, but it was the development of the eye-teeth that was most startling.
Thus the teeth of man constitute a regular and even series without any break and without any marked projection of one tooth above the level of the rest; a peculiarity which, as Cuvier long ago showed, is shared by no other mammal save one as different a creature from man as can well be imagined namely, the long extinct 'Anoplotherium'. The teeth of the Gorilla, on the contrary, exhibit a break, or interval, termed the 'diastema', in both jaws: in front of the eye-tooth, or between it and the outer incisor, in the upper jaw; behind the eyetooth, or between it and the front false molar, in the lower jaw.
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