. The testimony of the rocks; . 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. OBTHISINA VERNEUILI. LITTJITES COKNTr-ABIETIS. LINGULA LOWISII. certainty the early rocks in which they occur. And yet,though formed in a fashion that perished myriads of ages8* 90 THE PALiEONTOLOGICAL ago, how admirably does it not exhibit the articulated typeof being, and illustrate that unity of design which, amidendless diversity, pervades all na
. The testimony of the rocks; . 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. OBTHISINA VERNEUILI. LITTJITES COKNTr-ABIETIS. LINGULA LOWISII. certainty the early rocks in which they occur. And yet,though formed in a fashion that perished myriads of ages8* 90 THE PALiEONTOLOGICAL ago, how admirably does it not exhibit the articulated typeof being, and illustrate that unity of design which, amidendless diversity, pervades all nature. The moUusca of theSilurians ranged from the high cephalopoda, represented inour existing seas by the nautili and the cuttle-fishes, to thelow brachipods, some of whose congeners may still be de-tected in the tercbratula of our Highland lochs and bays,and some in the lingula3 of the southern hemisphere. Thecephalopods of the system are all of an obsolete type, thatdisappeared myriads of ages ago, — a remark which, withthe exceptions just intimated, and perhaps one or twoothers, applies equally to its brachipods; but of at least tAvoof its intermediate families, — the gasteropoda and lamelli-branchiata, — several of the forms res
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