214 CAMBRIAN BEACHIOPODA. 



74c. Middle Cambrian: "Tonto" sandstone at tlie head of Lava Canyon, Grand Canyon of the Colorado, Amz. 

 (C. D. Walcott, 1883). 

 Obolus (Westonia) euglyphus. 



74d. Middle Cambrian: Sandstone beds in "Tonto" shale just above massive sandstones, near mouth of Bass 

 Canyon, on the south side of the Grand Canyon of the Colorado, southeast of Powells Plateau, Ariz. (C. D. 

 Walcott, 1901). 



Lingulella perattenuata. 

 *Lingulella (Lingulepis) spatula. 



Micromitra (Paterina) superba. 

 Micromitra (Iphidella) pannula. 

 Lingulella lineolata. 



75. Upper Cambrian: Thin-bedded limestones below the base of the Ordovician in the Tonto group, near the 



water's edge at the mouth of Kanab Canyon, Grand Canyon of the Colorado, Ariz. (C. D. Walcott, 1879). 



Obolus zetus. 



Lingulella winona convexa. 



*Nisusia? (Jamesella?) kanabensis.l „, . . ,, , , 



*p t 'tVi rlt f These species may not occur m the same bed. 



76. Upper Cambrian: Arenaceous limestone at Hoyt's quarry, 4 miles (6.4 km.) west of Saratoga Springs, Sara- 



toga County, N. Y. (C. D. Walcott and Cooper Curtice, 1883). 

 Lingulella (Lingulepis) acuminata. 

 Dikellocephalus. 



76a. Upper Cambrian: Arenaceous limestone in a raQroad quarry 1 mile (1.6 km.) north of Saratoga Springs, 

 Saratoga County, N. Y. (C. D. Walcott and Cooper Curtice, 1883). 

 Lingulella (Lingulepis) acuminata. 



77. Upper Cambrian: Sandstone near the water below the falls at the high bridge, and also at several horizons 



in the section, the highest point being 70 to 75 feet (21 to 22 m.) above the water, in Ausable Chasm, Essex 



County, N. Y. (C. D. Walcott and Cooper Curtice, 1883 and 1886). 

 *Lingulella prima. 

 Lingulella (Lingulepis) acuminata. 



78 (=78s). Upper Cambrian: "St. Croix sandstone," quarry near St. Croix River, in suburbs of Osceola, Polk 

 County, Wis. (L. C. Wooster, 1883). 



*Finkelnburgia osceola. 

 *Finkelnburgia osceola corrugata. 

 Syntrophia barabuensis. 

 Ulaenurus quadratus Hall . 

 Spirodentalium osceola Walcott. 

 Bellerophon antiquatus Whitfield. 



Obolus (Westonia) aurora. 

 Lingulella mosia. 

 *Lingulella mosia osceola. 

 Lingulella winona. 

 ^Lingulella winona convexa. 

 Billingsella coloradoensis. 

 Finkelnburgia finkelnburgi. 



78a. Upper Cambrian: "St. Croix sandstone" in the topmost quarry on Mount Washington, near Eau Claire, 

 Eau Claire County, Wis. (L. C. Wooster, 1883). 

 Obolus sp. undt. | *Agraulos? thea Walcott. 



Dicellomus pectenoides. Crepicephalus iowensis (Hall). 



Dicellomus politus. I 



78b. Upper Cambrian: "St. Croix sandstone" 50 feet (15.2 m.) above St. Croix River, near the landing at 

 Osceola, Polk County, Wis. (Cooper Curtice, 1884). 

 Lingulella mosia. 

 Lingulella similis. 

 Finkelnburgia osceola. 



78c. Upper Cambrian: "St. Croix sandstone" at Osceola, Polk County, Wis. (C. Schuchert, 1893). 

 Obolus (Westonia) aurora. | Lingulella winona. 



Lini»ulella oweni: I Lingulella winona convexa. 



78d. Upper Cambrian: The upper portion of the "St. Croix sandstone" exposed in the bluffs at La Crosse, 

 La Crosse County, Wis. (C. D. Walcott, 1898). 

 Obolus matinalis. 



78s (=78). (C. Schuchert, 1893.) 

 Obolus (Westonia) aurora. Finkelnburgia finkelnburgi. 



Lingulella mosia. Finkelnburgia osceola. 



Lingulella mosia osceola. Finkelnburgia osceola corrugata. 



Lingulella winona convexa. 



