212 



CAMBEIAN BRACHIOPODA. 



66. (For stratigraphic position and association, see p. 139.) Upper Cambrian: Dunderberg shale [Walcott, 

 1908f , p. 184], on tbe first ridge north of the Dunderberg mine, Eureka district [Hague, 1892, Atlas], Eureka 

 County, Nev. (C. D. Walcott, 1880). 

 Obolus discoideus. 



Agnostus prolongus Hall and Whitfield. 

 Arethusina americana Walcott. 



67 (^67c). Upper Cambrian: Sandstone on Tatur Hill, 7 miles (11.2 km.) northwest of Burnet, Burnet County, 

 Tex. (C. D. Walcott, 1884). 



Obolus matinalis. 

 Obolus sinoe. 

 Lingulella acutangula. 

 Acrotreta microscopica. 

 Ptychoparia affinis (Walcott). 

 Ptychoparia diademata (Hall). 



67c (=67). 

 Obolus matinalis. 

 Lingulella acutangula. 

 Lingulella perattenuata. 



67z. Upper Cambrian: Sandstone at west 

 County, Tex. (C. D. Walcott, 1884). 

 Obolus matinalis. 

 Ptychoparia burnetensis Walcott. 



68 (=68e, 68y, and 68z). Upper Cambrian: 

 County, Tex. (C. D. Walcott, 1884). 

 Obolus matinalis. 

 Obolus tetonensis ninus. 

 Lingulella acutangula. 

 Acrotreta microscopica. 

 Billingsella coloradoensis. 

 Eoorthis indianola?. 

 Eoorthis remnicha texana. 

 Eoorthia wichitaensis. 

 Eoorthis wichitaensis laeviusculus. 

 *Huenella texana. 



Ptychoparia llanoensis Walcott. 

 Ptychoparia? metra Walcott. 

 Ptychoparia? urania Walcott. 

 Ptychoparia wisconsinensis (Owen). 

 Anomocare pero (Walcott). 



base of Tatur Hill, 7 miles (11.2 km.) northwest of Burnet, Burnet 



Interbedded sandstone and limestone, Packsaddle Mountain, Llano 



Platyceras texanum Walcott. 

 Ptychoparia affinis (Walcott). . 

 Ptychoparia diademata (Hall). 

 Ptychoparia llanoensis Walcott. 

 Ptychoparia similis Walcott. 

 Ptychoparia? urania Walcott. 

 Agraulos convexus Whitfield. 

 Anomocare pero (Walcott). 

 Chariocephalus sp. 



68e (=68). 

 Lingulella acutangula. 

 Acrotreta microscopica. 

 Billingsella coloradoensis. 



68y (=68). 

 Obolus sinoe. 

 Lingulella perattenuata. 



68z (=68). 

 Obolus matinalis. 



69. Upper Cambrian: Limestone near Honey Creek, Burnet County, Tex. (C. D. Walcott, 1884). 



Obolus sinoe. 

 Lingulella acutangula. 

 Lingulella texana. 

 Lingulella (Lingulepis) acuminata. 

 Acrotreta microscopica. 

 .Billingsella coloradoensis. 

 *Syntrophia alata. 

 Huenella texana. 



Huenella texana Iseviusculus. 



Capulus sp. 



Ptychoparia affinis (Walcott). 



Ptychoparia diademata (Hall). 



Ptychoparia llanoensis Walcott. 



Anomocare pero (Walcott). 



Pterocephalia sancti-sabse Roemer. 



Chariocephalus tumifrons Hall and Whitfield. 



