﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO59 



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 a thickened brachial valve showing the enlarged cardinal process, X I, paratype, 

 n6874n; (25) the posterior of the preceding enlarged, X 2, to show the cardinal 

 process in more detail; (26, 27) impression of the interior of the pedicle valve 

 and a replica of the pedicle interior prepared from it to show the form of the 

 muscle scars and the nature of the dental plates, X i» holotype, 116874c; (28) 

 impression of the muscle scars of another pedicle valve, X 2, paratype, 116874I1. 

 Tellico formation (sandstone No. 3), 0.3 mile northwest of Cold Springs 

 School, Wildwood (T.V.A. 147-SE) Quadrangle, Tenn. 



Plate 38 

 nothorthis, orthambonites, taphrorthis 



A. Taphrorthis emargxnata Cooper, new species 3^7 



( 1 ) Interior of an imperfect brachial valve showing the cardinalia, X 2, paratype, 

 117983b; (2) interior of an imperfect pedicle valve showing muscle scars and 

 median ridge, X 2, paratype, 1 17983a. 



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

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



B. Nothorthis tarda Cooper, new species 3 l S 



(3-S) Respectively exterior views of three pedicle valves, X 4, paratypes, n685ia-c ; 

 (6) exterior of a complete specimen, X 4, holotype, n685id; (7, 13) exterior 

 and interior of a brachial valve, X 4, paratype, 116851c; (8, 12) exterior and 

 interior of another brachial valve showing the muscle scars, X 4, paratype, 

 Il685if; (9-11) interior views of three pedicle valves showing small muscle 

 area, pallial sinuses, and dental plates, X 4, paratypes, n68sii, 116851a and 

 116851J ; (14, 15) interior of two brachial valves showing deeply entrenched 

 adductor scars, X 4, paratypes, n685ig and ii68sih. 



Pratt Ferry formation (lower third), 0.2 mile southeast of Pratt Ferry, 

 Blocton (15') Quadrangle, Ala. 



C. Taphrorthis peculiaris Cooper, new species 3 2 8 



(16, 17) Exterior and interior of the brachial valve, X 2, paratype, 117984a; 

 (18, 19) interior and exterior of the pedicle valve, X 2, paratype, 117984b; 

 (20) exterior of another pedicle valve, X 2, paratype, 117984c 

 Horizon and locality same as preceding. 



D. Nothorthis delicatula Ulrich and Cooper 315 



(21) Exterior of the pedicle valve, X 3, paratype, G.S.C. 9o67d; (22, 24) exte- 

 rior and interior of a young pedicle valve, X 3, paratype, G.S.C. 9o67f ; {23) ex- 

 terior of a large pedicle valve, X 3, lectotype, G.S.C. 9067c; (25, 26) exterior 

 and interior of a large brachial valve, X 3, paratype, G.S.C. 9067; (27, 28) exte- 

 rior and interior of another brachial valve, X 3, showing cardinalia, paratype, 

 G.S.C. 9067a; (29) interior of the preceding, X 4-5, showing cardinalia in 

 greater detail. 



Possibly an erratic in the lower part of the Levis shale, Levis, Quebec. 



E. Orthambonites tenuicostatus Cooper, new species 314 



(30-34) Respectively anterior, posterior, side, brachial, and pedicle views of a com- 

 plete specimen, X 3, holotype, 116875b; (35, 36) interior and exterior of a bra- 

 chial valve showing form of muscle scars, X 3, paratype, n6875e; (37) an- 

 other pedicle interior, X 3, paratype, 116875a; (38, 39) interior and exterior of 

 a pedicle valve, X 3, paratype, Ii6875d; (40) interior of the brachial valve show- 

 ing the cardinalia, X 3, paratype, 116875c. 



Pratt Ferry formation (lower third), 0.2 mile southeast of Pratt Ferry, 

 Blocton (15') Quadrangle, Ala. 



