. Relics of primeval life, beginning of life in the dawn of geological time. Fig. 5.—ArcluEocyathus profundus, Billings. Possibly a Coral of generalized type from the Lower Cambrian of LAnse a Loup,Labrador. A small Fig. 6.—Structures of A. profundus [magnified). From specimens in Peter Redpath Museum,(a) Lower acervuline portion. {h) Upper part, with three of the radiating laminaeand section of pores, (c) Portion of lamina, with pores, the calcareous skeleton un-shaded- 36 RELICS OF PRLMEVAL LIFE Jelly-fishes. If, with some naturalists, we regard theSponges as very humble members o
. Relics of primeval life, beginning of life in the dawn of geological time. Fig. 5.—ArcluEocyathus profundus, Billings. Possibly a Coral of generalized type from the Lower Cambrian of LAnse a Loup,Labrador. A small Fig. 6.—Structures of A. profundus [magnified). From specimens in Peter Redpath Museum,(a) Lower acervuline portion. {h) Upper part, with three of the radiating laminaeand section of pores, (c) Portion of lamina, with pores, the calcareous skeleton un-shaded- 36 RELICS OF PRLMEVAL LIFE Jelly-fishes. If, with some naturalists, we regard theSponges as very humble members of the coralgroup (Coelenterata), then we have a right to addthem to its representatives in the lowest Cambrian ;but perhaps they had better be ranked with thenext and lowest group of all—the Protozoa. These are the humblest of all the inhabitantsof the sea, presenting very simple, jelly-like bodieswith few organs, but sometimes producing complexand beautiful calcareous and siliceous coverings ortests. Animals of this type have been found in theLower Cambrian, though not in such vast multitudesas in some later formations. There are also in theCambrian some large, laminated, calcareous bodies(Cryptozoon of Hall), to
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