﻿1232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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ments of a brachial interior, showing rim, septal ridges, and cardinalia, hypotype, 

 24708b. 



Platteville formation (McGregor member), Rocktown, Wis. 

 (26) Brachial interior showing septal ridges, X 2, hypotype, 24705. 

 Platteville formation, Ripon Center, Wis. 



Plate 246 

 Glyptomena, Opikina, Pionomena 



A. Glyptomena ? bella Cooper, new species 882 



(1) Plasticine replica of the brachial exterior, X i» paratype, 117852b; (2) exte- 

 rior of the pedicle valve, X 1, holotype, 117852a. 



Murat formation, along the road and ridge 2 miles northwest of Lexington, 

 vicinity of Whistle Creek, Lexington (15') Quadrangle, Va. 



B. Opikina pulchella Cooper, new species 916 



(3, 4) Impression of the pedicle interior and anterior view of same showing 

 muscle scars and pallial marks, X 2, paratype, 117825b. 



Benbolt formation (base), 0.2 mile south of middle fork of Moccasin Creek, 

 i^ miles due south of Hansonville, Hansonville (T.V.A. 205-SW) Quadrangle, 

 Va. 



C. Opikina alata Cooper, new species 903 



(5) Interior of the brachial valve, X 2, showing septa and cardinalia, paratype, 

 117797b; (6) brachial view, X 1, of the holotype, 117797c; (7-11) respectively 

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



Edinburg formation (lower part Nidulites zone), 100 yards south of entrance 

 to Battlefield Crystal Caverns, on U. S. Highway 11, 1 mile north of Strasburg, 

 Strasburg (15') Quadrangle, Va. 



D. Opikina dubia Cooper, new species 906 



(12) Exterior of the brachial valve, X 2, paratype, 123273a. 



Botetourt formation (bed 3), near Cedar Grove Church and School, i£ miles 

 southeast of Harrisonburg, Harrisonburg (15') Quadrangle, Va. 



(13) Exterior of the pedicle valve, X 2, holotype, 123274a; (14) ornamentation, 

 X 4, of the preceding specimen. 



Botetourt formation, 1 mile northwest of Lexington, Lexington (15') Quad- 

 rangle, Va. 



E. Pionomena ? dubia Cooper, new species 901 



(15) Exterior of the pedicle valve, X I2, holotype, 98222. 



Effna formation, Porterfield Quarry, 5 miles east of Saltville, Maccrady 

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



F. Glyptomena sculpturata Cooper, new species 885 



(16, 17) Exterior and interior of the pedicle valve, showing ornamentation and 

 delthyrial cavity, X 2, paratype, 117856a; (18, 23) pedicle and brachial views of 

 a complete specimen, X 2, holotype, 117856c; (19, 20) exterior and interior of a 

 brachial valve showing ornamentation and cardinalia, X 2, paratype, 117856b; 

 (21, 22) interior and exterior of another brachial valve, X 2, showing cardinalia, 

 paratype, H78s6d. 



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

 Garden (15') Quadrangle, Va. 



Plate 247 

 Macrocoelia, Opikina, Rafinesquina 



A. Opikina ? planulata Cooper, new species 916 



(1) Interior of the brachial valve, X I, paratype, H7824d; (2) exterior of the 



