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An introduction to zoology, with directions for practical work (invertebrates). ANNELIDA 89 The sea-worms here mentioned are only a few representa- tives of the many to be found on our coasts.
![A manual of zoology. Zoology. 108 GENERAL PRINCIPLES OF ZOOLOGY. addition to which the skin functions as an accessory organ of more or less importance. Gills.âThe gills are usually thin-walled areas A manual of zoology. Zoology. 108 GENERAL PRINCIPLES OF ZOOLOGY. addition to which the skin functions as an accessory organ of more or less importance. Gills.âThe gills are usually thin-walled areas](https://c8.alamy.com/comp/RE0ANT/a-manual-of-zoology-zoology-108-general-principles-of-zoology-addition-to-which-the-skin-functions-as-an-accessory-organ-of-more-or-less-importance-gillsthe-gills-are-usually-thin-walled-areas-of-the-skin-which-are-abundantly-supplied-with-blood-vessels-and-where-richly-branched-tuftlike-projections-or-broad-leaves-have-grown-out-thus-furnishing-the-largest-possible-surface-for-the-interchange-of-gases-these-occur-in-such-a-position-as-to-be-most-exposed-to-fresh-water-in-the-crayfish-for-example-they-are-on-the-legs-where-the-motion-drives-fresh-water-constantly-through-them-f-RE0ANT.jpg)
A manual of zoology. Zoology. 108 GENERAL PRINCIPLES OF ZOOLOGY. addition to which the skin functions as an accessory organ of more or less importance. Gills.âThe gills are usually thin-walled areas
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