206 CAMBRIAN BRACHIOPODA. 



551i (=31m). (For stratigraphic position and association, see p. 149.) (C. D. Walcott, Stuart Walcott, and L. D. 

 Burling, 1906.) 

 Obolus. Agnostus. 



Lingulella. " Ptychoparia. 



Billingsella coloradoensis. Anomocare. 



55n (=31h). (For stratigraphic position and association, see p. 150.) Middle Cambrian: About 1,850 feet (564 m.) 

 above the Brigham quartzite and 2,350 feet (716 m.) below the Upper Cambrian, in the limestone 

 forming 2g of the Bloomington formation [Walcott, 1908f, p. 195], in Blacksmith Fork Canyon, about 10 

 miles (16.1 km.) east of Hyrum, Cache County, Utah (C. T. Walcott and L. D. Burling, 1906). 



Micromitra sculp tills. 



Ptychoparia. 



Dorypyge. 



55t (=31z). (For stratigraphic position and association, see p. 151.) (F. B. Weeks, 1905.) 

 Obolus (Westonia) ella. 

 Acrothele subsidua?. 

 Acrotreta ophirensis. 



55u. (For stratigraphic position and association, see p. 158.) Middle Cambrian: Limestones about 200 feet (61 m.) 

 above the Lower Cambrian [Walcott, 19081, p. 171], 0.25 mile (0.4 km.) below the Maxfield mine, in 

 Big Cottonwood Canyon, on the west front of the Wasatch Mountains, southeast of Salt Lake City, Salt 

 Lake County, Utah (F. B. Weeks, 1905). 



Micromitra (Iphidella) pannula. 



*Linnarssonella urania. 



56. (For stratigraphic position and association, see p. 139.) Upper? Cambrian: Limestone at Sierra Springs^ 

 eastern base of Lookout Mountain, Eureka district [Hague, 1892, Atlas], Eureka County, Nev. (C. D. 

 Walcott, 1880). 



Lingulella desiderata. 



Agnostus prolongus Hall and Whitfield. 



Agnostus tumid osus Hall and Whitfield. 



56a. Lower Cambrian: A limestone bowlder in the Sillery conglomerate on the south shore of St. Lawrence 

 River, 4 miles (6.4 km.) below Quebec, Canada (C. D. Walcott, 1889). 



Ptychoparia cf. subcoronata (Hall and Whitfield). 

 Ptychoparia sp. 



*Nisusia (Jamesella) amii. 

 Olenellus? sp. 

 Olenoides ellsi Walcott. 



561). Lower Cambrian: A limestone bowlder in conglomerate on the south shore of the island of Orleans, below 

 Quebec, Canada (C. D. Walcott, 1889). 

 Obolella crassa. I Microdiscus connexus Walcott. 



Hyolithes americanus Billings. | Ptychoparia sp. 



56c. (For stratigraphic position and association, see p. 147.) Lower Cambrian: Rome ("Montevallo") shale- 

 along road just north of Buck Creek, 1.125 miles (1.8 km.) northeast of Helena, Shelby County, Ala. 

 (T. E. Williard, 1906). 



*Micromitra (Paterina) major. 

 *Micromitra (Paterina) williardi. 

 *Obolus smithi. 

 Wimanella shelbyensis. 



Psedeumias transitans Walcott. 

 *Wanneria halli Walcott. 

 Agraulos?. 

 Hyolithes. 



56f. (For stratigraphic position and association, see p. 149.) Middle Cambrian: Nounan limestone [Walcott, 

 1908a, p. 6], on a ridge north of the creek which flows into Mill Canyon from the west, about 5 miles (8 km.) 

 west-southwest of Liberty and 15 miles (24.2 km.) west of Montpelier, Bear Lake County, Idaho (C. D.. 

 Walcott and L. D. Burling, 1906). 



Obolus matinalis. 

 *Lingulella manticula var. 

 Orthotheca. 



Solenopleura. 

 Ptychoparia 2 sp. 

 Anomocare. 



Agraulos. | Anomocarella. 



56g. (For stratigraphic position and association, see p. 149). Upper Cambrian: Limestone of the St. Charles 

 limestone [Walcott, 1908a, p. 6], in the valley of the stream which flows into Mill Canyon from the west, 

 about 6 miles (9.6 km.) west-southwest of Liberty and 15 miles (24.2 km.) west of Montpelier, Bear Lake- 

 County, Idaho (C. D. Walcott and L. D. Burling, 1906). 



Platyceras. 



Obolus discoideus. 

 Acrotreta idahoensis. 

 Billingsella coloradoensis 



Agnostus. 

 Ptychoparia. 



