. Cambrian Brachiopoda. Brachiopoda, Fossil. 800 CMIBRIAN BRACHIOPODA. on the railroad track below the Cliff House, Devils Lake, Sauk County; (83) near Trempealeau, Trempealeau County; (78) quarry near St. Croix River in the suburbs of Osceola, Polk County; and (134a) in a quarry 1 mile ( km.) south- east of the county coiu-thouse in Menomonie, Dunn County; all in Wisconsin. r Syntrophia calcifera (Billings) Plate CIV, tigm-es 1, la-i. Cmnerellacalcifera Billings, 1861, Canadian Naturalist, vol. 6, pp. 318-320, figs. 3a-c, p. 319. (Described and discussed as a new species. Figs. 3a-c are co
. Cambrian Brachiopoda. Brachiopoda, Fossil. 800 CMIBRIAN BRACHIOPODA. on the railroad track below the Cliff House, Devils Lake, Sauk County; (83) near Trempealeau, Trempealeau County; (78) quarry near St. Croix River in the suburbs of Osceola, Polk County; and (134a) in a quarry 1 mile ( km.) south- east of the county coiu-thouse in Menomonie, Dunn County; all in Wisconsin. r Syntrophia calcifera (Billings) Plate CIV, tigm-es 1, la-i. Cmnerellacalcifera Billings, 1861, Canadian Naturalist, vol. 6, pp. 318-320, figs. 3a-c, p. 319. (Described and discussed as a new species. Figs. 3a-c are copied in this monograph, PI. CIV, figs. 1, la, and lb, respectively.) Cainarella calcifera Billings, 1863, Geol. Survey Canada, Fifteenth Rept. Progress, figs. 247a-c, p. 231. (No text reference. Figs. 247a-c are copied from figs. 3a-c of the preceding reference.) CamereJla calcifera Billings, 1865, Geol. Sm-vej' Canada, Paleozoic Fossils, vol. 1, p. 220. (Localities mentioned.) Triplecia? calcifera (Billings), Hall and Clarke, 1892, Nat. Hist., New York, Paleontology, vol. 8, pt. 1, p. 270. (Merely changes generic reference.) Syntrophia? calcifera (Billings), Hall and Clarke, 1893, idem, pt. 2, p. 218, PL LXII, fig. 24. (Changes generic reference.) Syntrophia calcifera differs from S. nundina in its more pointed and incurved apex, stronger ventral sinus, and dorsal fold. It is more convex and rotund than S. j^rimordialis. The only interior parts known are in the form of a cast illustrated by Billings [lS61a, fig. 3c, p. 319] and copied in Plate CIV, figure lb; tliis indicates a weU-developed spondylium and a median supporting septum in the ventral valve. The form owes its specific name to its occurrence in the "calciferous ; Formation and locality.—Lower Ordovician: (3191)^ "Calciferous sandrock" at St. Timothy on the St. Law- rence, near the head of the Beauharnois Canal; (319u [Billings, 1861a, p. 320]) "calciferous sandrock " in the T
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