. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 126 Descriptive Zoolo ^1 <. however, is the only part eaten. It has a sweetish tnste. The scallop shell was worn as a badge by the crusaders, as evidence of having visited the Holy Land. Pearls. — These are formed of nacre, the material which constitutes the inner layer of the shell. They begin as dc|xxsit» around grains of sand or other foreign objects that have gained entrance within the shell. They are usually found between the mantle and the shell, but may be in almost any of the soft parts. It is said that the Chines
. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 126 Descriptive Zoolo ^1 <. however, is the only part eaten. It has a sweetish tnste. The scallop shell was worn as a badge by the crusaders, as evidence of having visited the Holy Land. Pearls. — These are formed of nacre, the material which constitutes the inner layer of the shell. They begin as dc|xxsit» around grains of sand or other foreign objects that have gained entrance within the shell. They are usually found between the mantle and the shell, but may be in almost any of the soft parts. It is said that the Chinese introduce little images into the cavity of the pearl oyster, leaving them to become coated over with nacre. The most valuable pearls are usually obtained from the pearl oyster, but they are often found in certain species of fresh-water clams. The most celebrated pearl fisheries are in the Persian Gulf. Characteristics of the Bivalve Mollusks. — The clam and most of the other bivalve mollusks have the following characteristics, and ^ave received various names, accord- ing as any given writer places special emphasis on one characteristic or another: — 1. There is no head; hence some designate the group Acephala. 2. There are large, leaflike gills, from which comes the name Lamellibranchiata. 3. There is usuall" muscular, tongue-shaped or hatchet- shaped foot, giving ix. o to the term Pelecypoda. 4. The mantle consists of two lobes, each lobe lining a valve; hence are called Bivalve 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 Colton, Buel P. (Buel Preston), 1852-1906. Toronto : Copp, Clark
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