. Animal studies. THE LIFE CYCLE 273 it has steadily increased in actual weight. Many herring, eels, and other soft-bodied fishes pass through stages simi- lar to those seen in the lady-fish. Another type of devel- opment is illustrated in the sword-fish. The young has a bony head, bristling with spines. As it grows older the spines disappear, the skin grows smoother, and, finally, the bones of the upper jaw grow together, forming a prolonged sword, the teeth are lost and, the fins become greatly modi- fied. Fig. 152 shows three of these stages of growth. The. Please note that these images are
. Animal studies. THE LIFE CYCLE 273 it has steadily increased in actual weight. Many herring, eels, and other soft-bodied fishes pass through stages simi- lar to those seen in the lady-fish. Another type of devel- opment is illustrated in the sword-fish. The young has a bony head, bristling with spines. As it grows older the spines disappear, the skin grows smoother, and, finally, the bones of the upper jaw grow together, forming a prolonged sword, the teeth are lost and, the fins become greatly modi- fied. Fig. 152 shows three of these stages of growth. The. 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
