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It does not terminate in a point as in other snakes, but is truncated obliquely, the abrupt surface of its extremity being either entirely flat, or more or less convex, and always covered with rough keels. The reptile assists its own movements by pressing the rough end to the ground, and from this peculiar form of the tail, the family has received the name of Uropeltidæ, or "Shield-tails."
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