Life in Rivers and Brooks
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1. Mayfly larva with tracheal gills, w.m.
2. Trout, stomach, t.s.
3. Frog skin with skin glands
4. Hortwort, t.s.
5. Moss animals (Plumatella), section through colony
6. Freshwater sponge, w.m.
7. Freshwater diatoms
8. Mixed desmids
9. Trout gills
10. Frog tongue
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