﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO43 



Page 

 pedicle valve, X h paratype, 97547b; (3) enlargement, X 2, of apex of preceding 

 specimen. 



Oranda formation, along the railroad \ mile east of Strasburg Junction, Stras- 

 burg (15') Quadrangle, Va. 



B. Orbiculoidea linvillensis Cooper, new species 276 



(4) Exfoliated brachial valve showing strong anterior pallial trunks, X 2, para- 

 type, 109637b; (5) exfoliated pedicle valve, X 2, holotype, 109637a. 



Oranda formation, 0.6 mile northwest of Linville Station, Broadway (15') 

 Quadrangle, Va. 



C. Schizotreta subconica Cooper, new species 281 



(6) Pedicle exterior, X 2, paratype, I09646d; (7) another pedicle valve, more ex- 

 foliated than the holotype, X 2, paratype, 109646b ; (8) replica of the pedicle ex- 

 terior prepared from an impression, X 2, paratype, I09646g; (9, 10) brachial 

 valves, X 2, para types, 109646c, f. 



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

 rangle, Ala. 



D. Orbiculoidea eximia Cooper, new species 275 



(11, 12, 15) Brachial, pedicle, and side views, X I, of a complete specimen, holo- 

 type, 1 09632 f ; (13) apical view of an imperfect pedicle valve showing details of 

 the foramen, X 4, paratype, I09632d; (14) brachial exterior, X 1, paratype, 

 109428b; (23) view of brachial valve showing apex, X 4, paratype, 117953a; 

 (16) imperfect pedicle valve, X 1, paratype, 109632b; (17) brachial valve, X I, 

 paratype, 109634b; (18) enlargement, X 2, of preceding; (19, 22) brachial 

 valve, X 1, X 2, the enlargement showing faint groove extending from apex to 

 posterior margin, paratype, 109428a; (20) apex of pedicle valve, X 4, paratype, 

 109632c; (21) another pedicle valve, partially exfoliated showing long plate in 

 pedicle slit, X 4, paratype, 109632a. 



Bromide formation (Pooleville member — Oxoplccia gouldi zone), Rock 

 Crossing of Hickory Creek, about center sec. 35, T. 5 S., R. 1 E., Criner Hills, 

 Carter County, Okla. 



Plate 21 

 Schizameon, Schizotreta 



A. Schizambon sp. 1 270 



(1, 2) Exterior and interior of a young specimen showing spines and foramen, 

 X 4, figured specimen, 123306. 



Effna — Rich Valley formations, Porterfield Quarry, 5 miles northeast of Salt- 

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



B. Schizambon sp. 2 270 



(3) Posterior of a small specimen showing foramen, X 8, figured specimen, 

 116829a; (4) exterior of a brachial valve, X 4, figured specimen, 116829b; 

 (5) interior of a brachial valve, X 4, figured specimen, 116829c; (6) exterior 

 of an imperfect valve showing the long spines, X 4, figured specimen, n6829d. 

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

 rangle, Ala. 



C. Schizotreta corrugata Cooper, new species 277 



(7) Imperfect pedicle valve showing foramen, X 4, paratype, 116808a; (8) 

 fragmentary pedicle valve showing foramen, X 2, paratype, 116808c; (9, 10) 

 exterior and interior of an incomplete young pedicle valve, X 4, specimen lost ; 

 (11, 12) exterior and interior views of an imperfect brachial valve, X 5, para- 

 type, n68o8d; (13) exterior of another brachial valve showing apex, X 4, para- 

 type, n68o8e; (14) exterior of a nearly perfect brachial valve, X 2, paratype, 



