. Ordovician fossils of north China. Paleontology; Paleontology. :—Brachiopoda from the Orthis Bed (iii) 11 of the Neichia Formation Davidson's fig. 3, PI. XXXIII measures thus: Greatest width = 14 mm Hinge line =14 ,, Height =10 ,, Proportion of height to width = An exterior impression of another pedicle valve (Ser. No. X205) is less per- fect than No. X204. Its greatest width is 6 mm. and the height, mm, giving a proportion of height to width of Its cardinal extremities are less extended and its convexity is not so strong. Its plications are also not so numerou
. Ordovician fossils of north China. Paleontology; Paleontology. :—Brachiopoda from the Orthis Bed (iii) 11 of the Neichia Formation Davidson's fig. 3, PI. XXXIII measures thus: Greatest width = 14 mm Hinge line =14 ,, Height =10 ,, Proportion of height to width = An exterior impression of another pedicle valve (Ser. No. X205) is less per- fect than No. X204. Its greatest width is 6 mm. and the height, mm, giving a proportion of height to width of Its cardinal extremities are less extended and its convexity is not so strong. Its plications are also not so numerous, but they show branchings in one or two places. Remarks: Except for its smaller size and more numerous plications this species agrees well with Orthis carausii Salter, as figured by Davidson. Horizon and Locality: Occurs with the preceding. Coll. C. C. Yii. (Ser. Nos. X 204, X 205; Cat. Nos. 3368, 3369). 6. Orthis neichiaensis Chang (sp. nov.) PI. I, Figs. 7a-d, 8a-d, ga-d, loa-b, & iia-d, and Text-figs. 1-3. The exterior impression of a typical brachial valve (Ser. No. X 218, PI. I, Fig. 7a) is subquadrate and wider than high. The hinge line is shorter than the greatest width which lies about the middle of the shell. The valve is moderately fiat with a sinal dejjression along the central portion. The surface is ornamented by about thirty-three simple and rounded plications with slightly wider interspaces which are occupied by very fine longitudinal and transverse lamellose strige. The sinus is bounded by two plications which bifurcate about two mm. below the beak. In its center are found four plications which are a little stronger than the others. The arrangement of the sinal plications is shown in Text-Figure I. Arrangement of the sinal plication in specimen No. X Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perf
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1922
