. Natural history object lessons : a manual for teachers. onff the mammals are the edentates or toothless o animals—the ant-eaters, sloths, and armadilloes. Thesehave neither incisors nor canines, and some have no molars ;but most of them have a few of the latter kind, simple andconical in shape, but without the usual covering of food consists of soft-bodied insects, and, in the case ofthe sloth, of soft leaves and twigs, hence teeth are littleneeded. Birds have no teeth. Reptiles and fish have many teeth;but generally they are of a much less complicated nature ANIMALS AND THEIR U
. Natural history object lessons : a manual for teachers. onff the mammals are the edentates or toothless o animals—the ant-eaters, sloths, and armadilloes. Thesehave neither incisors nor canines, and some have no molars ;but most of them have a few of the latter kind, simple andconical in shape, but without the usual covering of food consists of soft-bodied insects, and, in the case ofthe sloth, of soft leaves and twigs, hence teeth are littleneeded. Birds have no teeth. Reptiles and fish have many teeth;but generally they are of a much less complicated nature ANIMALS AND THEIR USES. 161 than those of mammals, being simply conical and curvedbackwards for the purpose of preventing the escape of prey,rather than for cutting or grinding. But innumerablemodifications occur. Thus the teeth of the deadly sharkare flat and lancet-like, the cutting edges being notchedlike a saw; the front teeth of the flounder are flat grind-ing teeth; other fish have convex teeth, so numerousand so closely packed over a broad surface, as to resemble. rig. 108.—Skull of the Cape Ant-eater. the paving-stones of a street; a few have teeth whichresemble bristles, and these are set together like thehairs of a brush. The common perch has teeth still moreslender, being so minute and numerous as to resemble thepile of velvet. The well-known pike is armed with teethscarcely less formidable than the canines of a carnivorousmammal, while the sturgeon and a few other fish are entirelytoothless. CHAPTER , The Tongue is the special organ of taste ; but the unrulymember has other and no less important duties assigned toit. In man it is one of the chief instruments of speech. In L
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