. Beginners' Zoology . Fig. 371. — Pouched Gopher {Geomys bursarius) x \, a large, burrowingfield rat, with cheek pouches for carrying grain. away by gnawing upon hard food, they become incon-veniently long, and may prevent closing of the mouth andcause starvation. The hard enamel is all on the front sur-face, the dentine in the rear being softer ; hence the in-cisors sharpen themselves by use to a chisel-like

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