Natural history of animals; . to their full size in one yean By means ofa collection of horny threads, called a byssus, they at-tach themselves to rocks, or to the ground. Pearl Oysters, or Aviculas, Figure 432, have shellsyielding the beautiful material called mother-of-pearl,extensively used for making and ornamenting a greatnumber of useful and beautiful articles. They alsoyield the oriental pearls. Unios, or River Mussels. These Mollusks abound in brooks, rivers, ponds, andfresh-water lakes. They are sometimes called Naiades,and there are very many kinds. It would take severalbooks larger
Natural history of animals; . to their full size in one yean By means ofa collection of horny threads, called a byssus, they at-tach themselves to rocks, or to the ground. Pearl Oysters, or Aviculas, Figure 432, have shellsyielding the beautiful material called mother-of-pearl,extensively used for making and ornamenting a greatnumber of useful and beautiful articles. They alsoyield the oriental pearls. Unios, or River Mussels. These Mollusks abound in brooks, rivers, ponds, andfresh-water lakes. They are sometimes called Naiades,and there are very many kinds. It would take severalbooks larger than this one to describe all the kindsfound in the United States. A few of the forms ofUnios are shown in Figures 435-439. Sometimesbeautiful and valuable pearls are found in them. Razor Shells, Clams, etc. The Razor Shells are very long and smooth. Theyburrow in the sand, and are good for food. The Com-mon Clam burrows in sand and mud, and is exten-sively used for food, and for bait for cod. 228 MOLLUSKS : ,^ Fig. 441 — Fig. 442. -Sphaerium. Th) New Fig. 440. — Astarte. Fig. 443. — Sphaerium. New England. Northern States.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
