﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1197 



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 Edinburg formation (Cyrtonotella zone), ravine at switch g mile east of 

 Strasburg Junction, Strasburg (15') Quadrangle, Va. 

 (15) Interior of the pedicle valve, X 2, paratype, 117476a. 



Shippensburg formation (about 50 feet above the base of the Pinesburg mem- 

 ber), railroad cut and field to the north, 2? miles southwest of Marion, Cham- 

 bersburg (15') Quadrangle, Pa. 



C. Sowerbyella nasuta Cooper, new species 787 



(18, 23) Brachial and pedicle views of a complete specimen, X 2, paratype, 

 117503a; (19-21) side, posterior, and anterior views of a complete specimen, 

 X 2, the holotype, 117503b; (26, 27) pedicle and brachial views of the holotype, 

 X 3, showing interareas and pseudodeltidium ; (22) pedicle exterior showing 

 narrow median fold, X 2, paratype, 117503c; (24) brachial exterior, X 2, para- 

 type, H7503g; (28, 29) respectively X2 and X3 enlargements of the pedicle 

 interior showing the pallial trunks, paratype, 117503c; (30) another pedicle 

 interior showing muscle and pallial marks, X 3, paratype, H7503f ; (31) brachial 

 interior, X 3, showing cardinalia and brachiophores, paratype, 117503d; (33) 

 brachial interior, X 2, paratype, 117503b. 



Chatham Hill formation, north slope of Walker Mountain, 2 miles south-south- 

 west of Chatham Hill, Chatham Hill (T.V.A. 218-NE) Quadrangle, Va. 

 (25) Pedicle view of a complete specimen, X 3, paratype, 117502a; (32, 34) inte- 

 rior views of two brachial valves, X 3, paratypes, 117502b, 117502c. 



Ward Cove formation (Nidulites bed), southwest of Tazewell in Thompson 

 Valley, Pounding Mill (15') Quadrangle, Va. 



Plate 200 

 Sowerbyella 



A. Sowerbyella compacta Cooper, new species 778 



(1-5) Respectively posterior, anterior, brachial, side, and pedicle views, X 2, of 

 the holotype, 117487a; (6) brachial interior showing cardinalia, X 2, paratype, 

 117487b. 



Benbolt formation, 1 mile west of Rye Cove, second cut west of McDavid's 

 house, Clinchport (T.V.A. 188-NW) Quadrangle, Va. 



B. Sowerbyella socialis crassa Cooper, new subspecies 796 



(7) Brachial view of a complete specimen, X 1, holotype, 117528a; (8-12) respec- 

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

 (14) enlargement X 6, of the exterior of the holotype. 



Wardell formation, Lloyd Carter's barn, 0.8 mile by road northeast of Rye 

 Cove School, Clinchport (T.V.A. 188-NW) Quadrangle, Va. 

 (13) Pedicle interior, showing pallial marks, X 3, paratype, 117529b. 



Wardell formation, on U. S. Highway 25E, 50 yards north of the intersection 

 at Thorn Hill, Avondale (T.V.A. 162-NW) Quadrangle, Tenn. 



C. Sowerbyella subcarinata (Ulrich) 797 



(15, 16) Brachial interiors, X 2, hypotypes, 117543a, 117543b; (17) pedicle exte- 

 rior showing carina and wrinkles along the posterior margin, X 2, hypotype, 

 117543c; (18) slab showing numerous individuals, X 2, hypotype, 117543d. 



Carters formation (Oxoplccia bed), quarry 0.3 mile north of Gate City, 

 Leeds (15') Quadrangle, Ala. 



Plate 201 



Sowerbyella 



A. Sowerbyella curdsvillensis (Foerste) 780 



(1-3) Pedicle, brachial, and side views, X 1, of a hypotype, 117491c; (4-7) re- 



