Our planet, its past and future; or, Lectures on geology . litcs (Fig. 7), of which (here is i GruptollthuB octobrnchlatuB. •hich (here is a large variety. The 96 LECTURES ON GEOLOGY. name of tlie one figured signifies eiglit-armcd gruplolite :it was found near Quebec. They are ver} sildonj Ibund asperlect as this, and in their imperfect state gave rise tovarious conjectures of their nature. At one time, theywere considered vegetables ; at another, slender orthoce-ratites: but now they are generally regarded as radiitoforms bcbnging to the acalephs, or sea-netlles. The twornraW figures represe
Our planet, its past and future; or, Lectures on geology . litcs (Fig. 7), of which (here is i GruptollthuB octobrnchlatuB. •hich (here is a large variety. The 96 LECTURES ON GEOLOGY. name of tlie one figured signifies eiglit-armcd gruplolite :it was found near Quebec. They are ver} sildonj Ibund asperlect as this, and in their imperfect state gave rise tovarious conjectures of their nature. At one time, theywere considered vegetables ; at another, slender orthoce-ratites: but now they are generally regarded as radiitoforms bcbnging to the acalephs, or sea-netlles. The twornraW figures represent the young of two distinct spe-cies. The shales of the Hudson period abound wiiii theremains of these singular animals, which are more rare inthe Devonian, and become extinct in the carboniferous;no remains of them having been Ibuud above the coal-measures. Beds in England of about the samp asthe Hudson-river group also abound with grapiolites,which, since they are generally found in shales, seem tohave thriven best in a muddy ocean, as the cora
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