﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1220, 



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 complete specimen, X i, holotype, 117807a; (6, 7) brachial and pedicle views 

 of a specimen smaller than the preceding, X I, paratype, 117807b; (8) brachial 

 interior showing the ridges and cardinalia, X 1, paratype, 117807c. 



Bromide formation (Mountain Lake member), cut on Oklahoma Highway 18, 

 NWi sec. 11, T. 1 S., R. 3 E., 1.8 miles south of Sulphur, Murray County, 

 Okla. 



B. Opikina quadrat a Cooper, new species 917 



(10) Pedicle interior, X I, paratype, 117826b; (9) pedicle exterior, X 1, para- 

 type, H7826d; (11) brachial exterior, X I, holotype, 117826c; (12) brachial 

 interior, X i, paratype, H7826f ; (13) posterior view of the preceding specimen, 

 X 2, showing the cardinal process. 



Ridley formation (top), east side of Marshall Knobs, 5 miles south of Mur- 

 freesboro, Murfreesboro (15') Quadrangle, Tenn. 



C. Opikina subplanodorsata Cooper, new species 920 



(14-18) Respectively anterior, posterior, side, brachial, and pedicle views of a 

 complete specimen, X 1, holotype, 117840a; (19) pedicle interior showing muscle 

 scars, X 1, paratype, 117840b. 



Wardell formation, hill west of the west fork of the center branch of Notchy 

 Creek, Avondale (T.V.A. 162-SW) Quadrangle, Tenn. 



D. Opikina speciosa Cooper, new species 918 



(20-24) Respectively pedicle, posterior, anterior, side, and brachial views of a 



complete specimen, X 1, paratype, 117833a; (25, 26) respectively X I and X2 

 views of a pedicle valve showing ornamentation, paratype, 117833d; (27, 28) 

 respectively X 1 and X 2 enlargements of the brachial interior, showing cardi- 

 nalia and ridges, paratype, 117833c. 



Ridley formation (lower third), east side of Marshall Knobs, 5 miles south 

 of Murfreesboro, Rutherford County, Tenn. 



Plate 242 

 Opikina 



A. Opikina sp. 1 924 



(1-5) Respectively pedicle, anterior, posterior, side, and brachial views of a com- 

 plete specimen, X 2, figured specimen, 1 17849. 



Benbolt formation (upper), east bank of a sinkhole south of Lakeview Church, 

 Virginia Highway 71, southeast \ of the east central subquad., Moll Creek 

 (T.V.A. 196-SE) Quadrangle, Va. 



B. Opikina dorsatiformis Cooper, new species 905 



(6) Exterior of the pedicle valve, X 1, paratype, 117800; (7-10) respectively 

 anterior, posterior, normal, and side views, X 2, of the preceding specimen. 



Edinburg formation (Cyrtonotella zone), ravine at the switch about i mile 

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



C. Opikina nasuta Cooper, new species 914 



(11, 12) Exterior and interior of a brachial valve, X 2, paratype, 117821a; 

 (13, 13a) exterior and side view of the pedicle valve, X T , showing narrow 

 anterior, holotype, 117821c 



Chatham Hill formation, 1.2 miles S. 31 E. of Sharon Springs, Burkes 

 Garden (15') Quadrangle, Va. 



D. Opikina bellula Cooper, new species 904 



(14-16) Anterior, pedicle, and side views of a pedicle valve, X T » holotype, 

 117799a; (18) exterior of the preceding pedicle valve, X 2, showing the orna- 

 mentation; (17, 21) posterior and exterior views of another pedicle valve, X 1, 

 paratype, 117799b; (22) pedicle view of the preceding specimen, X 2, showing 



