. Catalogues of the Silurian fossils of the island of Anticosti, with descriptions of some new genera and species. Paleontology; Paleontology. 65 less than the width. The posterior glabellar furrows have their inner ex- tremities about one-third of the whole width in from the outer margin and scarcely one-third the length from the posterior margin. They curve slightly forward and outward, and are distinctly impressed do^vn the sides of the glabella to the dorsal furrows. There is a second pair of fur- rows situated less than one-third the length in front of the posterior pair ; they are shorte
. Catalogues of the Silurian fossils of the island of Anticosti, with descriptions of some new genera and species. Paleontology; Paleontology. 65 less than the width. The posterior glabellar furrows have their inner ex- tremities about one-third of the whole width in from the outer margin and scarcely one-third the length from the posterior margin. They curve slightly forward and outward, and are distinctly impressed do^vn the sides of the glabella to the dorsal furrows. There is a second pair of fur- rows situated less than one-third the length in front of the posterior pair ; they are shorter and not so distinct. Neck furrow narrow and rather deeply sunk ; neck segment also narrow and well defined. Surface cov- ered with small rounded or obtusely pointed tubercles from one-fifth to one-fourth of a line in diameter at the base, and usually their own diameter apart from each other although they are sometimes more closely arranged. In certain conditions of preservation these tubercles appear to have an aperture in the top, but this is due to the wearing away of the crust ex- posing a central dot of the darker-coloured matrix with which the tuber- cles are filled. The sides of the glabella are so much inflated that they slightly overhaug the dorsal furrows. Length of the glabella 6J lines ; width 7J lines ; width of neck furrow I of a line ; width of neck segment, 1 line. This species is allied to such forms as Angelini's S. Wegalini, S- con- formis, and S- granulatus, but is distmct from them all South-west Point; Div. 4, A. G. Richardson. Genus Lichas, Fig. 22. Fig. 22.—Lichas Canadensis. ThePygidium. L. Canadensis, n. sp.—Pygidium nearly flat with three pairs of broad foliate ribs, the extremities of which form six projecting subtriangular denticulations around the margin. The axis is short, conical, scarcely one-third the whole length of the pygidium, nearly as broad as it is long, the apex broadly rounded and prominent, at the base gradually sloping
Size: 1827px × 1368px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookaut, bookcentury1800, bookdecade1860, booksubjectpaleontology
