﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1047 



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 Edinburg formation (Liberty Hall facies), Reservoir Hill, Wytheville, Va. 

 (5) Impression of brachial interior, X 3, paratype, 109386a. 



Edinburg formation (Liberty Hall facies — 50 feet above Lincolnshire) , Middle 

 River, \ mile north of Verona, Staunton (15') Quadrangle, Va. 



C. Paterula subcircularis Cooper, new species 239 



(7) Brachial valve, X 8, paratype, 109414a; (8) another brachial valve, of exfo- 

 liated interior, X 4, paratype, 109414c ; (9) pedicle valve, impression of interior, 

 X 3, holotype, 109414b; (10) plasticine replica of interior, X 4» prepared from 

 preceding. 



Stringtown shale = Womble formation (Big Fork chert), near center sec. 29, 

 T. 1 S., R. 12 E., about 2 miles southwest of Stringtown on south bank of North 

 Boggy Creek, near base of exposure, Atoka County, Okla. 



D. Paterula perfecta Cooper, new species 238 



(12, 22) Impressions of two brachial valves showing muscle marks, X 12, para- 

 types, 109404c and 109404c; (13, 23) two pedicle interiors, X 15, paratypes, 

 i094O4d and I09404g. 



Oranda formation, 4 miles northwest of Linville Station, Broadway (15') 

 Quadrangle, Va. 

 (11, 15, 17) Pedicle exteriors, X 10, X 8, X 8, paratypes, I09409q, 109409P, 

 109409-0; (16) brachial exterior, X 6, paratype, 109409b; (19, 21) pedicle inte- 

 riors with excellently preserved muscle areas, X IS. holotype, 109409k, and para- 

 type, 1094091; (14) interior of pedicle valve showing pedicle notch, X 10, 

 paratype, 109409c. 



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

 rangle, Ala. 

 (20) Brachial interior of an old specimen, X 10, paratype, 109408a. 



Botetourt formation, 1 mile northeast of Harrisonburg, Harrisonburg (15') 

 Quadrangle, Va. 

 (18) Pedicle interior impression, X 10, paratype, 109407. 



Edinburg formation (Liberty Hall facies), opposite bridge at Riverton, Front 

 Royal (15') Quadrangle, Va. 



E. Obolellina canadensis (Billings) 230 



(24) Brachial view of the exterior, X 1, holotype, G.S.C. 1150. 

 Leray-Rockland beds, Fourth Chute of the Bonnechere River, Renfrew 



County, Ontario, Canada. 



F. Obolellina magnifica (Billings) 231 



(25) Brachial interior, X h paratype, G.S.C. 1161b. 

 Rockland formation, Paquette Rapids, Ontario. 



G. Pseudobolus gibbosus (Willard) 194 



(27-29) Pedicle, brachial, and side views of young but complete specimen, X 1, 

 hypotype, 109422a; (26) the same enlarged X2; (30, 31) brachial and side 

 views of a fully grown brachial valve, X I, hypotype, 109422b. 



Murat formation, 2 miles northwest of Lexington, Lexington (15') Quad- 

 rangle, Va. 



Plate 25 



ACANTHOCRANIA, PeTROCRANIA 



A. Acantho crania setigera (Hall) 285 



(1, 5) Brachial exterior, X 2 and X I, of a large specimen attached to a brachial 

 valve of Strophomcna, figured specimen, 24739; (2) enlargement, X 4, of ante- 

 rior of preceding ; (3, 4) brachial interior, X 1 and X 2 , showing muscle scars, 

 figured specimen, 24743a. 



Decorah formation, Minneapolis, Minn. 



