. The Quarterly journal of the Geological Society of London. J. G. S. No. 237. b 2 MR. E. T. NEWTON ON THE OCCURRENCE OF [Feb. I904, from the Coal-Measures of the United States, but was afterwardsrecognized in beds of similar age in Russia and Australia. Theaccompanying figure (fig. 1. below) of the first-described specimen(Edestus minor) will call to mind the form of this ichthyodorulite,which has been thought to be a dorsal defence. To it have alsobeen assigned various other functions in the economy of the fish towhich it belonged : its true nature, however, remains uncertain. The segmented
. The Quarterly journal of the Geological Society of London. J. G. S. No. 237. b 2 MR. E. T. NEWTON ON THE OCCURRENCE OF [Feb. I904, from the Coal-Measures of the United States, but was afterwardsrecognized in beds of similar age in Russia and Australia. Theaccompanying figure (fig. 1. below) of the first-described specimen(Edestus minor) will call to mind the form of this ichthyodorulite,which has been thought to be a dorsal defence. To it have alsobeen assigned various other functions in the economy of the fish towhich it belonged : its true nature, however, remains uncertain. The segmented character of Edestus minor is shown in thisfigure ; and separate segments of this and other species have beenmet with in North America, showing that each tooth was attachedto a firm base, elongated in one direction and grooved above forthe reception of the under part of a similar segment. Several suchsegments were united in the original specimen. Fig. 1.—Side view of Edestus minor. (^ )[From Geol. Surv. Illinois, vol. iv (1870) pi. i, fig. 2.].
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
