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PART II CHAZYAN AND RELATED BRACHIOPODS— COOPER IO9I 



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D. Atelelasma planum Cooper, new species S 2 3 



(20) Posterior view showing large delthyrium, X I, holotype, 110142b; (24) bra- 

 chial view, X 1, of the preceding; (21, 22) side and brachial views of a speci- 

 men from which the beak has been rubbed away, X h paratype, 110142a; (23) 

 brachial exterior, X 2, of the preceding. 



Benbolt formation (?), ii miles southeast of Knoxville, Knoxville (T.V.A. 

 147-NW) Quadrangle, Tenn. 



E. Atelelasma sp. 1 



(25) Pedicle interior, X 1, figured specimen, 110141. 



Little Oak formation, \ mile east of Cobb City = Cobb, Glencoe (7£') Quad- 

 rangle, Ala. 



F. Atelelasma ? multicostum ( Hudson) 520 



(26) Brachial interior, X 2, showing cardinalia and deeply impressed, large adduc- 

 tor scars, hypotype, noii7d; (27, 30, 33) respectively apical, side, and brachial 

 views of a complete specimen, X I, hypotype, 110117b; (28) pedicle interior, 

 X 2, showing spondylium and lateral plates on the edge of the delthyrium, 

 hypotype, 110117a; (29) posterior view, X 2, of a complete specimen, hypotype, 

 A.M.N.H. 25048/1; (31) brachial exterior, X I, hypotype, A.M.N.H. 25048/3; 

 (32) enlargement of the muscle-attachment surface of the pedicle valve, hypo- 

 type, Y.P.M. S359; (34) brachial interior showing adductor field, X 2, hypo- 

 type, 110117c. 



Crown Point formation, Sloop Bay, Valcour Island, Lake Champlain, Platts- 

 burg (15') Quadrangle, N. Y. 



G. Atelelasma dorsoconvexum Cooper, new species 5*9 



(35) Impression of the pedicle interior, X 1, paratype, 110129a; (36) plasticine 

 replica of part of the exterior of a pedicle valve, X 2, paratype, noi29d; (37) 

 another pedicle impression, X 1, paratype, 110129b; (38) brachial interior im- 

 pression, X I, paratype, 110129c. 



Basal Athens, just east of road intersection, 2i miles south-southeast of Rice- 

 ville, Calhoun (T.V.A. 125-SW) Quadrangle, Tenn. 

 (39) Brachial interior, X 2, paratype, 110128b. 



Basal Athens, 600 feet S. 40 E. of the railroad crossing 1 mile northeast of 

 the courthouse, Athens, Athens (T.V.A. 125-NE) Quadrangle, Tenn. 



Plate 81 

 Atelelasma, Plectorthis 



A. Atelelasma variabile Cooper, new species 525 



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

 plete specimen, X 2, holotype, H7oi5d; (6) posterior view, X 3, showing plates 

 on side of delthyrium of holotype. 



Lenoir formation (calcarenite below the Mosheim limestone), southwest side 

 of the cemetery behind Friends Church in the north corner of Friends ville, 

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



B. Atelelasma sulcatum Cooper, new species 524 



(7-1 1 ) Respectively side, posterior, anterior, brachial, and pedicle views, X I, of 

 the holotype, 117013; (12) posterior view, X 2, of the holotype showing lateral 

 plates; (13) part of pedicle valve of holotype, X 2, showing ornamentation. 



Tulip Creek formation (152 feet above the top of the basal sand), first creek 

 east of U. S. Highway 77, SE^NEiNE* sec. 25, T. 2 S., R. 1 E., Carter County, 

 Okla. 



C. Atelelasma sp. 2 



(14) Brachial interior, X 2, figured specimen, 117016. 



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