﻿IO92 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 Botetourt limestone, junction of Virginia Highways 311 and 114, \ mile south- 

 west of Catawba, Salem (15') Quadrangle, Va. 



D. Plectorthis lebanonensis Cooper, new species 449 



(15) Brachial exterior, X 2, paratype, 110834a; (16) brachial interior, X 2, para- 

 type, 110834b; (17) pedicle exterior, X 2, holotype, 110834c. 



Lebanon formation, on Tennessee Highway 16, 3.6 miles northwest of its junc- 

 tion with U. S. Highway 241, Shelbyville, Bedford County, Term. 



E. Plectorthis tenuis Cooper, new species 454 



(18) Exfoliated pedicle valve showing impression of the muscle area, X ii para- 

 type, 1 17027; (19) impression of the muscle area, X 2, of the preceding. 



Benbolt formation, south side of Mount Hagan School, Hilton (T.V.A. 

 197-NW) Quadrangle, Va. 



(20, 21) Respectively X 1 and X 2 enlargements of the pedicle valve of a complete 

 specimen, paratype, 117028a; (22-24) respectively pedicle, anterior, and brachial 

 views of a complete specimen, X 2, paratype, 117028b; (25-27) respectively bra- 

 chial, side, and posterior views, X 2, of the holotype, 117028c; (28, 29) side and 

 pedicle views of a large specimen, X 2, paratype, ii7028d. 



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

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

 Quadrangle, Va. 



Plate 82 



Atelelasma, Cyrtonotella, Hesperorthis, Orthambonites, Pionodema, 

 Productorthis, Ptychopleurella 



A. Hesperorthis ? costellata Cooper, new species 350 



(1) Brachial view, X 2, of the holotype, 116918; (2-6) respectively anterior, 

 posterior, side, pedicle, and brachial views, X 1, of the holotype. 



Botetourt formation, north side of Virginia Highway 114, 2.3 miles west of 

 the Montgomery-Roanoke County line, 12 miles northeast of Blacksburg, Va. 



B. Hesperorthis tenuicostata Cooper, new species 357 



(7-1 1 ) Respectively posterior, anterior, side, brachial, and pedicle views of a com- 

 plete specimen, X 2, paratype, 1 16923. 



Lenoir formation (shale streak in granular beds below the Mosheim lime- 

 stone), behind the Quaker Church, north corner of Friendsville, Concord 

 (T.V.A. 138-SW) Quadrangle, Tenn. 



C. Productorthis americana Cooper, new species 336 



(12) Exterior of a pedicle valve, X 1, paratype, 116886b. 

 Horizon and locality same as A above. 



D. Orthambonites tennesseensis Cooper, new species 313 



(13-17) Respectively brachial, anterior, side, posterior, and pedicle views of a com- 

 plete specimen, X 1, holotype, 116878b; (18) brachial view, X i£, of the pre- 

 ceding specimen ; ( 19) brachial interior showing cardinalia, X 2, paratype, 

 n6878d; (20) pedicle interior showing thickened anterior end of muscle area, 



X 2, paratype, 116878a. 



Arline formation, 100 yards southwest of the Negro Cemetery, \ mile north- 

 east of Friendsville, Concord (T.V.A. 138-SW) Quadrangle, Tenn. 



E. Cyrtonotella subquadrata Cooper, new species 324 



(21, 22) Brachial and pedicle views of an imperfect specimen, X 1, paratype, 

 1 16895. 



Benbolt formation, north side of road, 1.1 miles northeast of Lee Valley, Lee 

 Valley (T.V.A. 171-NW) Quadrangle, Tenn. 



