﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER Il6l 



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 tively brachial, side, anterior, posterior, and pedicle views, X 2, of the same 

 specimen as the preceding. 



Decorah formation (Ion member), 8 miles south of Cannon Falls, Goodhue 

 County, Minn. 



C. Pionodema conradi (N. H. Winchell) 988 



(12, 13) Brachial and side views of a complete specimen, X 1, hypotype, 15749a; 

 (14) brachial view, X 2, of the preceding. 

 Platteville formation, Beloit, Rock County, Wis. 



D. Pionodema minncsotensis Cooper 99° 



(15-19) Respectively anterior, posterior, brachial, side, and pedicle views of a com- 

 plete specimen, X 1, hypotype, 117327a. 



Decorah formation (Ion member ?), Fountain, Fillmore County, Minn. 



E. Pionodema minneapolis (N. H. Winchell) = P. subaequata (Conrad) 992 



(20-24) Respectively pedicle, posterior, side, anterior, and brachial views of a com- 

 plete specimen, X I, hypotype, 48681a. 



Decorah formation (Spechts Ferry member ?), Minneapolis, Minn. 



F. Pionodema uniplicata Cooper 996 



(25-29) Respectively brachial, posterior, side, anterior, and pedicle views of a com- 

 plete specimen, X 1, hypotype, 86571a. 



Decorah formation (Spechts Ferry member), Elmira, Olmstead County, 

 Minn. 

 (30) Pedicle interior showing form of muscle area and pallial sinuses, X 2, 

 hypotype, II734*- 



Platteville formation ?, Janesville, Wis. 

 (3*> 3 2 ) Another pedicle interior, X 2, in normal view and tilted to show diver- 

 gent dental plates, thickened adductor region, low median ridge, and narrow 

 apical plate, hypotype, 117342; (33) view of the interarea, X 4, showing large 

 teeth, delthyrium, and narrowly swollen apical plate, same as preceding. 



Decorah formation (Spechts Ferry member), Fountain, Fillmore County, 

 Minn. 



G. Pionodema sp. 1 996 



(34-37) Respectively brachial, side, posterior, and pedicle views of a complete 

 specimen, X 2, figured specimen, 86583c ; (38, 39) interior and exterior of a 

 pedicle valve, X 2, figured specimen, 86583a ; (40) brachial interior, showing 

 cardinal process and short brachiophore supports, X 2, figured specimen, 86583b. 

 Chaumont formation, loose in bed of Black River, just below the dam at the 

 head of the island, Watertown, N. Y. 



Plate 155 

 Fascifera, Paurorthis, Pionodema 



A. Pionodema mimiscida Willard 991 



(1) Brachial view of a small specimen, X 1, hypotype, Columbia Univ. 

 26405 (ioi3)b; (2, 3) brachial and posterior views, X 2, of the preceding; (4-7) 

 respectively brachial, anterior, side, and pedicle views of a complete and well- 

 formed specimen, X 2, hypotype, Columbia Univ. 26405(1013)3; (8) pedicle 

 view, X 1, of preceding; (9, 10) brachial and pedicle views of a crushed but 

 larger specimen than the two preceding, X 2, hypotype, Columbia Univ. 

 26405(1013)0. 



Hatter formation (Hostler member), Waterside, Everett (15') Quadrangle, 

 Pa. 



