﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1205 



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 Pratt Ferry formation, 0.2 mile south of Pratt Ferry, Blocton (15') Quad- 

 rangle, Ala. 



H. Isophragma ponder osiim Cooper, new species 737 



(25) Plasticine replica of the pedicle exterior, X 2, paratype, 1 23261 ; (31) 

 pedicle exterior, X 2, paratype, 123262a. 



Yellow-weathering limestone on 25-foot sandstone at base of Eureka group, 

 3 miles north of Martin Ranch on west side of hill 8167, Roberts Mountains 

 (i°) Quadrangle, Nev. 

 (26-30) Respectively anterior, pedicle, posterior, brachial, and side views of a 

 complete specimen, X 2, holotype, 123259a; (32) brachial view, X 1, of the 

 holotype. 



Yellow-weathering limestone on 25-foot sandstone at base of Eureka group, 

 2 miles north of Martin Ranch, Roberts Mountains (l°) Quadrangle, Nev. 



I. Bimuria superba Ulrich and Cooper 771 



(33, 34) Respectively X 1 and X ii enlargements of a large brachial valve, 

 hypotype, 11 0981. 



Arline formation, quarry at Marion, Marion (T.V.A. 218-SE) Quadrangle, 

 Va. 



Plate 211 

 Bimuria 



A. Bimuria immatura Cooper, new species 766 



( 1 ) Pedicle interior showing teeth and small pedicle siphon, X 4, paratype, 

 110976J; (2) posterior view of the same specimen, X 6, showing the foramen 

 of the pedicle siphon; (13) another view of the same specimen, X 6, showing 

 the siphon more clearly; (3) interior of the brachial valve showing the diver- 

 gent septa, X 4, paratype, no976n; (4) same specimen as preceding, X 4, 

 tilted to show brachial processes and median ridge; (5) anterior, X 3, of the 

 holotype, H0976g; (6) pedicle interior tilted to show teeth, X 4, paratype, 

 110976k; (9-11) pedicle, brachial, and side views, X 4, of the holotype; (7, 8) 

 posterior and anterior views of two brachial interiors showing median plates 

 and cardinalia, X 4, paratypes, 110976m and 110976P; (12) brachial view of a 

 small specimen, X 6, showing pedicle siphon, paratype, 1109761. 



Effna-Rich Valley formations, Porterfield Quarry, 5 miles east of Saltville, 

 Maccrady (T.V.A. 218-NW) Quadrangle, Va. 



B. Bimuria superba Ulrich and Cooper 771 



(15, 18) Interior of the brachial valve seen in normal view and tilted to show 

 median septa and brachial processes, X 2, paratype, 108200b; (14, 17) posterior 

 views of the same specimen as shown in the preceding views, X 3, showing the 

 cardinal process and details of the median septa; (19, 23) respectively X 1 and 

 X 2 views, showing foramen, cardinal process and chilidial plates, of the holo- 

 type, 108200a; (24) pedicle view, X i, of the holotype; (20) pedicle interior, 

 X 2, showing pallial markings, paratype, io820of ; (22) pedicle interior showing 

 pallial marks, X ii, paratype, 108200c; (25) impression of the pedicle interior 

 showing the pallial marks, X ii (specimen later etched for brachial interior). 



Arline formation (middle), north side of wagon road in glade, \ mile south- 

 east of Friendsville, Concord (T.V.A. 138-S W) Quadrangle, Term. 



(16, 21) Interior and exterior of a pedicle valve, X I, showing details of the 

 pallial marks, paratype, 1 08201. 



Arline formation, 6 to 10 miles southeast of Loudon, Loudon (30') Quad- 

 rangle, Tenn. 



