. Cambrian Brachiopoda. Brachiopoda, Fossil. OBOLID^. 575 Yenckuang, Sintai district, Shantung; and (C32) a fine-grained bluish-black limestone bowlder believed to have come from the lower part of the Kisinling limestone [Blackwelder, 1907b, p. 272], collected in river drift 1 mile ( km.) south of Chonpinghien, on Nankiang River, eouthern Shensi; both in China. DiCELLOMUS PECTENODDES OVllitfielcl). Text figures 48A-B; Plate LII, figures 6, 6a-c. Obolus pectenoides Whitfield, 1875, Kept. Reconnaissance Black Hills of Dakota, by Ludlow, p. 103, unnumbered plate, figs. 1-3. (Described and disc
. Cambrian Brachiopoda. Brachiopoda, Fossil. OBOLID^. 575 Yenckuang, Sintai district, Shantung; and (C32) a fine-grained bluish-black limestone bowlder believed to have come from the lower part of the Kisinling limestone [Blackwelder, 1907b, p. 272], collected in river drift 1 mile ( km.) south of Chonpinghien, on Nankiang River, eouthern Shensi; both in China. DiCELLOMUS PECTENODDES OVllitfielcl). Text figures 48A-B; Plate LII, figures 6, 6a-c. Obolus pectenoides Whitfield, 1875, Kept. Reconnaissance Black Hills of Dakota, by Ludlow, p. 103, unnumbered plate, figs. 1-3. (Described and discussed as a new species.) Obolus f pectenoides Whitfield, 1880, U. S. Geog. and Geol. Survey Rocky Mtn. Region, Kept. Geology and Resources Black Hills of Dakota, by Newton and Jenney, pp. 838-339, PI. II, figs. 18 and 19. (Described. The specimens represented by figs. 18 and 19 are redrawn in this monograph, PI. LII, figs. 6 and 6a, respectively.) Obolella pectenoides (ViTiitfield), Schuchert, 1897, Bull. IT. S. Geol. Survey No. 87, p. 275. (Merely changes generic reference.) Dicellomus pectenoides (^Tiitfield), Walcott, 1901, Proc. U. S. Nat. Mus., vol. 23, p. 673. (Merely changes generic reference.) Dicellomus pectenoides C^Tiitfield), Walcott, 1905, idem, vol. 28, p. 316. (Characterized.) This is the largest shell of the several species of the genus. A ventral valve 9 mm. long has a width of 11 mm. All that is known of the structure of the shell indicates that it was like D. politus (Hall) (PL LII) and D. nanus (ileek and Hay den) (PI. IJII). This siiecies differs from all other described species b}" the anterior posi- tion of the central muscle scars of the dorsal valve, its larger size, and the thickening beneath the visceral cavity of the ventral valve. Area of ventral valve short and mucli like that of D. nanus (PI. LIII, fig. Ic). Specimens from Eau Claire, Wisconsin, show a tliickenlng of the shell beneath the visceral cavity of the ventral valve not unlike â ,.
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