﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO93 



Page 



F. Pionodema crassipunctata Cooper, new species 989 



(23-27) Posterior, anterior, brachial, side, and pedicle views, X 1, of the holo- 

 type, 1 17326. 



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

 \\ miles south of Hansonville, Hansonville (T.V.A. 205-S W) Quadrangle, Va. 



G. Hesperorthis virginiensis Cooper, new species 359 



(28-32) Respectively anterior, posterior, side, brachial, and pedicle views of a com- 

 plete specimen, X 1, holotype, 116927a. 



Oranda formation, just west of the junction of Virginia County Highways 

 617 = 910 and 777, on 777, i mile north of Green Mount Church, 4 to 5 miles 

 north of Harrisonburg, Broadway (15') Quadrangle, Va. 



H. Ptychoplenrella globularis Cooper, new species 3^5 



(33. 34) Brachial and posterior views of a complete specimen, X 2, holotype, 

 116955c; (35) brachial view, X 3, of the preceding specimen; (36, 37) interior 

 of a small brachial valve, X 3, tilted to show cardinalia and in normal interior 

 view, paratype, n6955d; (38) another brachial interior showing the cardinalia, 

 X 3, paratype, 116955a; (39) pedicle interior showing elongate diductor scars 

 and thickened adductor track, X 3, paratype, 116955b. 

 Horizon and locality same as D above. 



I. Orthambonites tennesseensis Cooper, new species 313 



(40) Brachial view of a complete specimen, X 2, paratype, 116881. 

 Horizon and locality same as A above. 



J. Atelelasma cf. A. decorticatum Cooper, new species 5^ 



(41, 42) Interior and exterior views of a pedicle valve, X r, figured specimen, 

 1 1 7010. 



Lincolnshire formation, south side of road opposite Shiloh Church, northwest 

 subquad., Pressmens Home (T.V.A. 171-NE) Quadrangle, Tenn. 



K. Atelelasma variabile Cooper, new species 5 2 5 



(43-47) Respectively brachial, anterior, posterior, side, and pedicle views of a com- 

 plete specimen, X 2, paratype, 117015c. 

 Horizon and locality same as B above. 



L. Atelelasma art. A. variabile Cooper, new species 525 



(48-52) Respectively posterior, side, pedicle, anterior, and brachial views of a 

 well-preserved, complete specimen, X 2, figured specimen, 1 17996. 

 Horizon and locality same as B above. 



M. Atelelasma dorsoconvexum Cooper, new species 5 T 9 



(S3) Impression of the brachial interior, X 2, paratype, 117011b; (54) impression 

 of another brachial interior showing pallial marks, X 2, paratype, H70iif ; (55) 

 impression of the pedicle interior, X 2, showing filling of spondylium, holotype, 

 H70iih; (56) small slab preserving a pedicle and brachial impression, X i» 

 paratypes, U70iid, 117011c; (57) the pedicle impression, X 2, illustrated in the 

 preceding figure. 



Athens formation (base), just east of road intersection 2\ miles southeast of 

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



Plate 83 

 Desmorthis, Plectorthis 



A. Desmorthis nevadensis Ulrich and Cooper 447 



(1, 4) Pedicle exteriors, X 2, paratypes, 91342c, 91342a; (13) enlargement X4 

 of fig. 1 to show hollow costellae; (2, 3) brachial exteriors, X 2, paratypes, 

 9i344g, 91344c; (6) brachial interior, X 3, paratype, 91344c; (7) pedicle interior 

 showing small pseudodeltidium, X 3» paratype, 9i344d; (8) pedicle interior 



