﻿IO56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 zone), west bank of Conococheague Creek, on U. S. Highway 40, at Wilson, 

 7 miles west of Hagerstown, Williamsport (15') Quadrangle, Md. 



D. Orthambonites minus Cooper, new species 304 



(16-20) Posterior, pedicle, side, brachial, and anterior views, X 3, of the holotype, 

 1 1 6882. 



Tulip Creek formation, about 90 feet below top, east edge of NE£ sec. 25, 

 T. 2 S., R. 1 E., east side of U. S. Highway 77, 2\ miles north of Springer, 

 Carter County, Okla. 



E. Orthambonites subconvexus Cooper, new species 312 



(21, 22) Respectively X 1 and X 2 enlargements of the brachial interior, para- 

 type, 109844b; (26) exterior, X 1, of preceding; (23, 24) exterior and interior 

 of the pedicle valve, X 1, holotype, 109844a; (25) holotype, X 2. 



Oil Creek formation (75 to 100 feet below the top), SvV^ sec. 31, T. 1 S., 

 R. 1 W., on West Spring Creek, east of Pooleville, Murray County, Okla. 



F. Orthambonites rotundiformis Cooper, new species 311 



(27) Impression of the pedicle interior showing scars of ponderous dental plates, 

 teeth, and pallial marks, X 2, paratype, 109842a; (35) plasticine replica of the 

 brachial exterior, X 2, paratype, 100842b. 



Basal Athens formation, on Cleveland-Benton road, 5 to 5^ miles east of 

 Cleveland, East Cleveland (T.V.A. 120-NE) Quadrangle, Tenn. 



(28-30) Side, pedicle, and brachial views of a complete specimen, X 2, holotype, 

 109843a; (33) brachial interior, X 2, paratype, 109843b; (34) pedicle interior, 

 X 2, paratype, 109843c. 



Basal Athens (Christiania beds), 600 feet S. 40 E. of the highway and rail- 

 road crossing 1 mile northeast of Athens, above quarry, Athens (T.V.A. 

 125-NE) Quadrangle, Tenn. 



(31) Impression of the brachial valve, X 3, paratype, 109840!; (32) impression 

 of the pedicle interior, X 2, paratype, 10984011; (36, 37) interior of old brachial 

 valve showing pallial and muscle marks, and the plasticine replica prepared from 

 the impression, X 2, paratype, 109840J ; (38) pedicle interior impression showing 

 ovarian impressions and muscle scars, X 2, paratype, i0984of; (39) plasticine 

 replica of the pedicle exterior from a mold, X 2, paratype, I09840g. 



Basal Athens formation, roadside just east of intersection, i\ miles south- 

 southeast of Riceville, Calhoun (T.V.A. 125-SW) Quadrangle, Tenn. 



Plate 35 



Orthambonites 



A. Orthambonites mostellerensis Cooper, new species 306 



(1-4) Brachial, side, posterior, and pedicle views of a complete specimen, X I, 

 holotype, 109810b; (8) brachial interior, X 2, of the holotype; (6) pedicle inte- 

 rior, X 1, of holotype; (7) pedicle interior, X 2, paratype, 109810c; (9) 

 another pedicle interior showing large teeth and crural fossettes, X 2, paratype, 

 109810a; (5) exterior, X I, of preceding; (10) brachial interior showing thick 

 cardinal process and brachiophores, X 2, paratype, 109810c. 



Little Oak formation, cut on L. and N. RR., I mile northwest of Mosteller, 

 Columbiana (15') Quadrangle, Ala. 



B. Orthambonites parwcrassicostatns Cooper, new species 309 



(11-15) Anterior, side, pedicle, brachial, and posterior views of a perfect specimen, 

 X 2, holotype, 116872a; (16) brachial view of another complete specimen, X I, 

 paratype, 116872b; (22) same, X2; (17) brachial interior, X 2, paratype, 

 116872c. 



