. Beginners zoology. Zoology. CHAPTER III SPONGES Suggestions.—In many parts of North America, fresh-water sponges may,by caieful found growing on rocks and logs in clear water. They are brown, creamy, or greenish in colour, and re- semble more a cushion-like plant than an animal. They have a char- acteristic gritty feel. They soon die after removal to an aquarium. A number of common small bath sponges may be bought and kept for use in studying the skeleton of an ocean sponge. These sponges should not have large holes in the bottom; if so, too much of the sponge has been cut away.
. Beginners zoology. Zoology. CHAPTER III SPONGES Suggestions.—In many parts of North America, fresh-water sponges may,by caieful found growing on rocks and logs in clear water. They are brown, creamy, or greenish in colour, and re- semble more a cushion-like plant than an animal. They have a char- acteristic gritty feel. They soon die after removal to an aquarium. A number of common small bath sponges may be bought and kept for use in studying the skeleton of an ocean sponge. These sponges should not have large holes in the bottom; if so, too much of the sponge has been cut away. A piece of marine sponge preserved in alco- hol or formalin may be used for showing the sponge with its flesh in place. Microscopic slides may be used for showing the spicules. The small fresh water sponge (Fig. 21) lacks the more or less vase- like form typical of sponges. It is a rounded mass growing upon a rock or a log. As indicated by the Arrows, where does water enter the sponge? This may be tested by putting colour ing matter in the water near the living sponge. Where does the water come 07/f? (^Fig. 22.) Does it pass through ciliated chambers in its course ? Is the Fig. 22. — Section of fresh-water sponge (enlarged), c 17. Fig. 21. Fresh-water Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coleman, Walter M. Toronto : Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
