. The testimony of the rocks; . OLYPTOCRINUS DECADACTYLUS. (Hudson River Group,Lower Silurian.) HISTORY OF ANIMALS. 89 exclusively of theii* remains, gradually died out in the timesof the Old Red Sandstone, and disappeared for ever fromcreation after the Carboniferous Limestone had been de-Fig. CALTMENE BLITMENBACHII. posited. The Paleontologist knows no more unique familythan of the Trilobites, or a family more unlike anywhich now exists, or a family which marks vdih more Fig. 49. Fig. 50. Fig. 61.

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