. A manual of zoology. . FlG. 165.—A, advanced embryo of Anodonta ; B, free glochidium. /.provisional byssus ; s, shell; sh, hooks ; s??i, adductor muscle ; so, sense organs ; iu, cilia. (From Korschelt and Heider's Embryology.) lar foot; there are two abductor muscles, and there are two pairs of gills. But, on looking over a collection of shells of various bivalves, it will be found that certain of them differ from that of the fresh-water mussel in not having the two valves of the shell alike. This inequality between the two valves of the shell is strongly marked in the scallops, and eve
. A manual of zoology. . FlG. 165.—A, advanced embryo of Anodonta ; B, free glochidium. /.provisional byssus ; s, shell; sh, hooks ; s??i, adductor muscle ; so, sense organs ; iu, cilia. (From Korschelt and Heider's Embryology.) lar foot; there are two abductor muscles, and there are two pairs of gills. But, on looking over a collection of shells of various bivalves, it will be found that certain of them differ from that of the fresh-water mussel in not having the two valves of the shell alike. This inequality between the two valves of the shell is strongly marked in the scallops, and even more so in the oysters. The oysters are also examples of Pelecypods, which have only one adductor muscle instead of two ; and the oyster, which is unable to. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1900
