192 CAMBKIAN BRACHIOPODA. 



31. (For stratigrapliic position and association, seep. 158.) Middle Cambrian: Shales at the Ohisholm mine, 

 southwest slope of Ely Mountains, 3 miles (4.8 km.) northwest of Pioche, Lincoln County, Nev. (C. D. 

 Walcott and J. E. W., 1885). 



Micromitra (Iphidella) pannula. 

 Obolus (Westonia) ella. 

 *Lingulella dubia. 

 Eocystites longidactylus Walcott. 

 Hyolithes billingsi Walcott. 



Zacanthoides typicalis (Walcott). 

 Ptychoparia piochensis Walcott. 

 Anomocare parvum Walcott. 

 Bathyuriscus howelli Walcott. 

 Bathyuriscus productus (Hall and Whitfield). 



31a. (For stratigraphic position and association, seep. 158.) Lower Cambrian: Limestone and interbedded sili- 

 ceous shales of the Pioche formation [Walcott, 1908a, p. 11], just above the quartzite on the east side of the 

 anticline, near Pioche, Lincoln County, Nev. (C. D. Walcott and J. E. W., 1885). 



*Micromitra (Iphidella) pannula. 

 *Acrothele spurri. 

 *Acrothele subsidua hera. 

 *Acrotreta primaeva. 

 *Billingsella highlandensis. 

 Hyolithes billingsi Walcott. 

 Bellerophon antiquatus Whitfield. 



*01enellus gilberti (Meek). 

 Olenoidea sp. 



Oryctocephalus primus Walcott. 

 Zacanthoides levis (Walcott). 

 Crepicephalus augusta Walcott. 

 Crepicephalus liliana Walcott. 

 Ptychoparia sp. 



31c (=54o; same horizon as 32e). (For stratigraphic position and association, see p. 151.) Middle Cambrian: About 

 900 feet (274.3 m.) above the Brigham quartzite and 3,300 feet (1,006.5 m.) below the Upper Cambrian, in 

 the limestone forming lb of the Ute limestone [Walcott, 1908f, p. 196], in Blacksmith Fork Canyon, about 

 10 miles (16.1 km.) east of Hyrum, Cache County, Utah (L. D. Burling, 1905). 



Syntrophia cambria. 



Zacanthoides. 



Ptychoparia subcoronata (Hall and Whitfield). 



Dorypyge ? quadriceps (Hall and Whitfield). 



Obolus mcconnelli. 

 Acrotreta cf . ophirensis. 

 Acrotreta sp. undt. 

 Otusia utahensis. 

 Eoorthis zeno. 



31d. (=541). (For stratigraphic position and association, see p. 152.) Middle Cambrian: About 500 feet (152.4 m.) 

 above the Brigham quartzite and 3,700 feet (1,127.8 m.) below the Upper Cambrian, in the Spence shale 

 member of the Ute limestone [Walcott, 1908f, p. 197], in Blacksitiith Fork Canyon, about 10 miles (16.1 

 km.) east of Hyrum, Cache County, Utah (F. B. Weeks, 1905). 



Obolus (Westonia) ella?. 



Ptychoparia. 



31e (=54a). (For stratigraphic position and association, seep. 151.) Middle Cambrian: About 750 feet (228.6 m.) 

 above the Brigham quartzite and 3,440 feet (1,048.5 m.) below the Upper Cambrian, in the shales forming 

 2a of the Ute limestone [Walcott, IQOSf, p. 196], in Blacksmith Fork Canyon, about 10 miles (16.1 km.) east 

 of Hyrum, Cache County, Utah (L. D. Burling, 1905). 



Obolus (Westonia) ella. 



Ptychoparia. 



31h (=55n). (For stratigraphic position and association, see p. 150.) (F. B. Weeks, 1905.) 



311 (=54h). (For stratigraphic position and association, seep. 149.) Middle Cambrian: About 3,140 feet (957.1 

 m.) above the Brigham quartzite and 1,050 feet (320 m.) below the Upper Cambrian, in the limestones 

 forming la of the Bloomington formation [Walcott, 1908f, p. 194], in Blacksmith Fork Canyon, about 9 miles 

 (14.4 km.) east of Hyrum, Cache County, Utah (L. D. Burling, 1905). 



Lingulella desiderata. 



Agnostus. » 



31m (=55h). (For stratigraphic position and association, see p. 149). Upper Cambrian: About 175 feet (53.3 m.) 

 above the Middle Cambrian and 1,050 feet (320 m.) below the top of the Upper Cambrian, near the base of 

 the limestones forming 3 of the St. Charles limestone [Walcott, 1908f, p. 192], in Blacksmith Fork Canyon, 

 about 9 miles (14.4 km.) east of Hyrum, Cache County, Utah (L. D. Burling, 1905). 

 Obolus sp. undt. 



Lingulella manticula. Ptychoparia. 



Billingsella coloradoensis. 



31n (=55g). (For stratigraphic position and association, see p. 149.) Upper Cambrian: About 250 feet (76.2 m.) 

 above the Middle Cambrian and 975 feet (297.2 m.) below the top of the Upper Cambrian, in the upper part 

 of the limestone forming 3 of the St. Charles limestone [Walcott, 1908f, p. 192], in Blacksmith Fork Canyon, 

 about 9 miles (14.4 km.) east of Hyrum, Cache County, Utah (L. D. Buxling, 1905). 



Acrotreta? sp. 



Anomocare. 



