. Zoology : for students and general readers . Zoology. Fiff. 174.—Mactra ovalis, natural size.—After Morse. tine, while the siphons are very long and furnished with two shelly styles. Pearls are sometimes produced in bivalve shells by particles of sand getting in between the mantle and the shell, which. Fig. 175.—Panopcea arctica, natural size.—After Morse. cause an irritation to the tissues of the mantle and the for- mation of a nacreous slielly matter around the nucleus. Excellent pearls are sometimes found in fresh-water Please note that these images are extracted from scanned pa
. Zoology : for students and general readers . Zoology. Fiff. 174.—Mactra ovalis, natural size.—After Morse. tine, while the siphons are very long and furnished with two shelly styles. Pearls are sometimes produced in bivalve shells by particles of sand getting in between the mantle and the shell, which. Fig. 175.—Panopcea arctica, natural size.—After Morse. cause an irritation to the tissues of the mantle and the for- mation of a nacreous slielly matter around the nucleus. Excellent pearls are sometimes found in 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
