﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1227 



Plate 238 

 Opikina 



Page 



A. Opikina speciosa Cooper, new species 9!8 



(1) Brachial view of a complete specimen, X 1, showing wrinkles on the posterior 

 margin of the brachial valve, paratype, 117839b; (2, 3) respectively X 1 and 

 X 2 enlargements of the pedicle interior showing the muscle scars, paratype, 

 117839!; (4) another pedicle interior, X 1, paratype, 117839b; (5) brachial 

 interior showing subperipheral rim and septa, X 1, paratype, 1178396; (6, 7) 

 respectively X 1 and X 2 enlargements of a brachial interior showing cardinalia 

 and pallial marks, paratype, 117839^ 



Ridley formation =z Wardell formation, on U. S. Highway 27, just northwest 

 of Chickamauga Creek, Kensington (T.V.A. 106-SE) Quadrangle, Ga. 



B. Opikina gregaria Cooper, new species 911 



(8, 9) Respectively X 1 and X 2 enlargements of the brachial view of a speci- 

 men preserving an attenuate cardinal extremity, paratype, 117814a; (10, 11) 

 respectively X 1 and X 2 views of another complete individual, paratype, 

 117814c; (12-15) respectively side, posterior, anterior, and pedicle views of a 

 complete specimen with slightly obtuse cardinal extremities, X 1, holotype, 

 117814b; (16) brachial view of the preceding specimen, X 2, showing orna- 

 mentation; (17, 18) two brachial interiors showing septa and cardinalia, X 2, 

 paratypes, 117814c, H78i4d. 



Bromide formation (Mountain Lake Member), long cut on Oklahoma High- 

 way 99, SWiNW^SWi sec. 12, T. 1 N., R. 6 E., 3 miles south of Fittstown, 

 Pontotoc County, Okla. 



Plate 239 

 Macrocoelia, Opikina 



A. Opikina glabella Cooper, new species 910 



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

 plete specimen, X Ij paratype, 123267a; (6, 7) pedicle and brachial views, X 2, 

 of the preceding specimen. 



Upper Arline formation, north side of wagon road in glade, £ mile southeast 

 of Friends ville, Concord (T.V.A. 138-SW) Quadrangle, Tenn. 



B. Opikina septata Salmon 918 



(8, 9) Brachial and pedicle views of a complete specimen, X 1, paratype, 117829a; 

 (22, 23) respectively X 1 and X 2 enlargements of the pedicle interior showing 

 the flabellate muscle area indistinctly, paratype, 117829b; (26, 27) respectively 

 X 1 and X 2 enlargements of the brachial interior showing septa and cardinalia, 

 holotype, 117829c; (10-13) respectively anterior, side, brachial, and posterior 

 views of a large, complete specimen, X 1, hypotype 117827a; (21) enlargement, 

 X 4, of the exterior of the pedicle valve of the preceding showing the costellae 

 and fila crossing them; (28) brachial interior showing considerably thickened 

 ridges, X 2, hypotype, 117827b. 



Lebanon formation (upper half), cut on U. S. Highway 41, f mile south of 

 Knox Branch, 9 miles southeast of Murfreesboro, Rutherford County, Tenn. 



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

 well-formed specimen, X I, hypotype, 1 17828; (19, 20) pedicle and brachial 

 views of the preceding hypotype, X 2, showing ornamentation and interarea. 

 Lebanon formation (upper half), U. S. Highway 41, i\ miles northwest of 

 Mount Olivet, about 10 miles southeast of Murfreesboro, Rutherford County, 

 Tenn. 



