. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. name from scale • tion. of " seraphim/' their singular like ornamenta- The Trilobites,. though still sufficiently abundant in some local- ities, have undergone a yet further diminution since the close of the Upper Silurian. In both America and Europe quite a number of gen- eric types have survived from the Silurian, but few or no new ones make their appearance during this period in either the Old Fig. 88.—a b, Spirorbis , enlarged. Upper Sil
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. name from scale • tion. of " seraphim/' their singular like ornamenta- The Trilobites,. though still sufficiently abundant in some local- ities, have undergone a yet further diminution since the close of the Upper Silurian. In both America and Europe quite a number of gen- eric types have survived from the Silurian, but few or no new ones make their appearance during this period in either the Old Fig. 88.—a b, Spirorbis , enlarged. Upper Silurian, America ; c, Spiro?-bis spimUiJera, of the natural size and enlarged, Devonian, Canada. (Af- ter Hall and the Author.). 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 Nicholson, Henry Alleyne, 1844-1899. Edinburgh, London, Blackwood
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Keywords: ., bookaut, bookcentury1800, bookdecade1870, booksubjectpaleontology
