﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER I187 



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 (18, 21) brachial and pedicle views of another complete specimen, X 3, paratype, 

 1174491 ; (22) pedicle view of a nearly perfect specimen preserving a large patch 

 of lamellae, X 3, paratype, ii744od; (23) impression of the pedicle interior pre- 

 pared by burning the shell and showing form of the pedicle muscle scars, X 2, 

 paratype, ii7449g; (24) brachial interior, X 3, paratype, 117449a. 



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

 Creek, 1? miles due south of Hansonville, Hansonville (T.V.A. 205-SW) Quad- 

 rangle, Va. 



E. Leptelloidea leptelloides ( Bekker ) 7^3 



(25) Brachial view of a complete specimen showing ornamentation, delthyrium, 

 cardinal process, and chilidial plates, X 3, hypotype, 84257c ; (26) normal view 

 of the exterior of a brachial valve showing interarea and cardinal process twisted 

 into a hypercline position, X 3, hypotype, 84257b; (29, 30) interior views of the 

 same specimen as preceding, X 3, showing disk, septum, shaft of cardinal process, 

 and brachiophores, and tilted to show edge of disk; (27) pedicle interior tilted 

 to show teeth with strong fossettes and thickened muscle area, X 3» hypotype, 

 84257d; (28) another pedicle interior showing the delthyrial cavity, muscle 

 scars, and adductor pit, X 3, hypotype, 84257a. 



Kuckers formation (Caa), Kohtla, Estonia. 



Plate 189 

 Leptellina 



A. Leptellina pulchra Cooper, new species 753 



(1) Exterior of the pedicle valve showing loosely crowded lamellae, X 1, para- 

 type, 1 17443; ( 2 "4) posterior, anterior, and side views of a complete specimen, 

 X I, holotype, U7444d; (14) brachial view, X 2, of the holotype; (5) exterior 

 of a pedicle valve, X I, showing difference in size of costellae, paratype, 117444c; 

 (6, 16) exterior and side view of a full-grown pedicle valve, X 1, paratype, 

 117444a; (7, 17) side and interior views of another pedicle valve, X I, paratype, 

 ii7444e; (18) same pedicle interior as preceding, X 2, showing form of muscle 

 scar and pallial marks; (8) brachial view of a complete specimen not preserving 

 lamellae but showing costellae clearly, X 1, paratype, 117444b; (9, 10) brachial 

 and pedicle views of the preceding specimen, X 2, showing major and minor 

 costellae; (11) brachial view of another complete specimen, X I, paratype, 

 H7444f; (12, 13, 15) respectively brachial, posterior, and pedicle views of the 

 preceding specimen, X 2, showing interarea, cardinal process, chilidial plates, and 

 pseudodeltidium ; (19) brachial interior, X 1, showing elevated disk, paratype, 

 117444b; (20-22) posterior, anterior, and normal views of the preceding brachial 

 valve, X 2, showing elevated disk with pallial marks on slope anterior to disk, 

 median septum, cardinal process, chilidial plates, and brachiophores; (23) disk 

 region of another brachial interior showing cardinalia, X 2, paratype, H7444g. 

 Effna-Rich Valley formations, Porterfield Quarry, 5 miles east of Saltville, 

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



B. Leptellina tennesseensis Ulrich and Cooper 756 



(24) Brachial view, X T , hypotype, 117456a; (25-29) respectively brachial, poste- 

 rior, anterior, side, and pedicle views, X 2, of the preceding specimen. 



Arline formation (10 feet below "Holston" = Red Knobs), 1 mile east-north- 

 east of Friendsville, Louisville (T.V.A. 138-SE) Quadrangle, Tenn. 



C. Leptellina occidentalis Ulrich and Cooper 751 



(30) Exterior of the pedicle valve, X 2, showing traces of lamellae, hypotype, 

 108133b; (31) exterior of a brachial valve, X 2, hypotype, 108133d; (32) two 

 valves showing pedicle interior with the small muscle areas, X 2, hypotype, 



