﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO5I 



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 Effna formation, on the north side of Virginia Highway 114, 7 miles northeast 

 of Lusters Gate, near Blacksburg, Va. 



B. Schisotreta posteroconvexa Cooper, new species 279 



(5, 6) Side and posterior views of the pedicle valve, X 3, holotype, 116801b. 



Base of Athens formation (beds with Chris tiania) , 0.2 mile southeast of 

 Britton Church, 2^ miles northeast of Calhoun, Calhoun (T.V.A. 125-SW) 

 Quadrangle, Term. 



C. Pachyglossa dorsiconvexa Cooper, new species 225 



(7, 8) Exterior and interior of the pedicle valve, showing apical region, X 3. 

 paratype, 11 7976. 



Pratt Ferry formation, 0.2 mile southeast of Pratt Ferry, Blocton (15') 

 Quadrangle, Ala. 



D. Acrotrcta magna Cooper, new species 246 



(9, 10) Apical and side views of the pedicle valve, X 3, holotype, 109724a; (11) 

 plasticine squeeze showing a replica of the exterior of the brachial valve, X 3, 

 paratype, 109724b; (12) exterior, X 5, of the same paratype showing details of 

 ornamentation. 



From boulders in the Mystic conglomerate, Range 6, Lot 20, 2\ miles north of 

 Mystic, Stanbridge Township, Quebec, Canada. 



E. Torynelasma tornyiferum Cooper, new species 258 



(13-15) Exterior, side, and interior views of a large brachial valve, X 10, showing 

 high median septum and spooniike plate, slightly broken at the anterior end, 

 paratype, n6825f ; (16) posterior view of a pedicle valve, X 10, paratype, 

 116825c 



Pratt Ferry formation (lower 3 feet), 0.2 mile southeast of Pratt Ferry, 

 Blocton (15') Quadrangle, Ala. 



F. Lingulella Virata Cooper, new species 201 



(17, 18) Interior views of two pedicle valves, X 4, showing apical region, para- 

 types, 117975b and 117975c; (19) apex of specimen shown in fig. 18 enlarged 

 X 8 to show apical structures in more detail; (21, 22) exterior and interior of a 

 nearly perfect brachial valve showing ornamentation and apical structures, re- 

 spectively X2 and X 3, paratype, 117975a; (23) apical region, X 6, of the pre- 

 ceding; (20) exterior of a large brachial valve, X 3, paratype, 1 17980. 

 Horizon and locality same as preceding. 



G. Schisotreta corrugata Cooper, new species 277 



(27) Interior of a pedicle valve (see pi. 21, C, fig. 18, for exterior view), showing 

 foramen and traces of muscle scars, X 3, paratype, 117972a; (28) posterior part, 

 X 6, of the preceding, showing foramen in greater detail; (24, 25) exterior and 

 interior of a nearly complete brachial valve, X 2, holotype, 116808-I; (26) inte- 

 rior of a brachial valve showing flattened marginal rim and traces of the mus- 

 cles, X 3, paratype, 117972b. (For the exterior of this specimen see pi. 21, C, 

 fig. 14.) 

 Horizon and locality same as preceding. 



Plate 29 

 Orthidiella, Trematorthis 



A. Trematorthis masoni Ulrich and Cooper 341 



(1-5) Brachial, posterior, side, pedicle, and anterior views of a complete specimen, 

 X 3, hypotype, 116863d; (6) brachial interior, X 4, showing brachiophores and 

 supporting swellings, hypotype, n6863g; (7) pedicle interior showing pallial 

 trunks, X 3, paratype, 95876a; (15) exterior, X 3, of same; (8) posterior view 

 showing apical foramen, X 3, lectotype, 95876c; (11) exterior, X 3, of preced- 

 ing; (14) posterior of pedicle valve, X 6, hypotype, n6863f; (9, 10) posterior 



