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Comparative anatomy and physiology. Chap. VI.] GILLS OF FISHES, 233 the gill sacs open separately to the exterior, but in the hag the ducts unite and open by a common orifice
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Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. GILLS IN POSITION GILLS PULLED DOWN Fig. 109.—The gills and gill chamber of a lobster.
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