. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. THE CARBONIFEROUS PERIOD. 177 these grooves there seems to have been attached a row of short jointed calcareous filaments or " ; A few Star-fishes and Brittle-stars are known to occur in the Carboniferous rocks; but the only other Echinoderms of this period which need be noticed are the Sea-urchins [Ec/wioids). Detached plates and spines of these are far from rare in the Carboniferous deposits; but anything like perfect specimens are
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. THE CARBONIFEROUS PERIOD. 177 these grooves there seems to have been attached a row of short jointed calcareous filaments or " ; A few Star-fishes and Brittle-stars are known to occur in the Carboniferous rocks; but the only other Echinoderms of this period which need be noticed are the Sea-urchins [Ec/wioids). Detached plates and spines of these are far from rare in the Carboniferous deposits; but anything like perfect specimens are exceedingly scarce. The Carboniferous Sea-urchins agree with those of the present day in having the body enclosed in a shell, formed by an enormous number of calcareous plates articulated together. The shell may be regarded as, typically, nearly spherical in shape, with the mouth in the centre of the base, and the excretory opening or vent at its summit. In both the ancient forms and the recent ones, the plates of the shell. 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
