A pictorial atlas of fossil remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology." . andanus or Screw-pine. Mr. Artis observes, that they bear considerable analogy to the stems of the Stapelice of ourgardens; but still, the external form, which Is the only character visible, does not furnishsufficient ground for their being positively referred to that genus. The stem is markedlongitudinally with double keels or ridges, which terminate at different heights spirally round thestem, and have small tubercles
A pictorial atlas of fossil remains, consisting of coloured illustrations selected from Parkinson's "Organic remains of a former world," and Artis's "Antediluvian phytology." . andanus or Screw-pine. Mr. Artis observes, that they bear considerable analogy to the stems of the Stapelice of ourgardens; but still, the external form, which Is the only character visible, does not furnishsufficient ground for their being positively referred to that genus. The stem is markedlongitudinally with double keels or ridges, which terminate at different heights spirally round thestem, and have small tubercles at their terminations. There are likewise slight annulardepressions, mostly distinct, but in some places two or more unite. The stem is straight, simple, and cylindrical, and is compressed towards the summit. It issometimes found six feet in length, and from one to four inches in diameter. It is generallycoated with a carbonized bark. Fig. 1, shows a portion of the stem of the natural size. Fig. 2. The upper extremity, in which the tubercular terminations of the double keels or ridgesare seen at a, b. Found associated with Calamites in the clay-bind of Leabrook * Cui/M ^CC . ^^A/^.S FOSSIL FLORA. 55 PLATE XIX.•Fibrous Sigillaria. brosa, of Artis.) Stems more or less flattened, with the external surface longitudinally furrowed, and uniformlyornamented with rows of deeply imprinted symmetrical figures, disposed with much regularity,are among the most abundant vegetable remains in the coal formation. These are namedSigillarioB, from the Latin word sigilluni, signifying a seal, in allusion to the extreme regularityof the imprints on the surface. When found in an upright position, at right angles to the plane ofthe stratum, the original cylindrical form of the tree is commonly preserved; and many examplesare now known of groups of erect Sigillarije, with their roots extending into the surroundingclay or sandy loam ; the roots proving to be the fossil bodies called Stigma
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectpaleontology, bookyea
