﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II9I 



Page 



(8) Brachial interior, X 4, showing oblique ridge in low, bilobed disk, paratype, 

 1 10924. 



Chatham Hill formation, Grayson Farm, 4 miles southwest of Bland, Bland 

 County, Va. 



C. Bilobia hemisphaerica Cooper, new species 760 



(10, 11) Pedicle and brachial views of a poorly preserved but complete specimen, 

 X l| paratype, 117462; (12-15) respectively brachial, posterior, side, and pedicle 

 views, X 2, of the preceding specimen. 



Dark shale below Eureka quartzite, north slope of hill 8167, Martins Ridge, 

 Monitor Range, Roberts Mountains (i c ) Quadrangle, Nev. 



D. Bilobia hemisphaerica Cooper, new species 760 



(16, 17) Brachial and pedicle views of a complete specimen, X I, slightly com- 

 pressed laterally, paratype, 111099a; (18) same as preceding, X 2, brachial view; 

 (19-23) respectively anterior, posterior, pedicle, side, and brachial views, X 2, of 

 the holotype, 111099b; (25, 26) respectively Xi and X2 enlargements of a 

 complete specimen seen from the brachial side and from which the brachial 

 valve has been dissolved to leave an impression of its interior showing the lobate 

 disk, paratype, 111099c; (27) impression of the brachial interior showing form 

 of muscle area, X 2, paratype, ni099d; (28) impression of another pedicle inte- 

 rior muscle area and the pits formed by prominent pseudopunctae, X 3, paratype, 

 ni099e; (32) brachial interior, X 3, showing cardinalia and lobed disk with 

 short median septum, paratype, ni099f. 



Oranda formation, \ mile west of Strasburg along railroad tracks, Strasburg 

 (15') Quadrangle, Va. 



(24) Brachial view, X 3, of a complete specimen, paratype, 117461a; (36) interior 

 of the brachial valve, X 3, showing cardinalia, paratype, 117461b. 



Oranda formation (lower), just west of junction of Virginia County High- 

 ways 617 = 910 and 777, on Highway 777, i mile north of Green Mount Church, 

 Broadway (15') Quadrangle, Va. 



(29-31) Umbonal, normal, and posterior views of a pedicle interior impression 

 showing form of muscle area, ovarian impressions, and small median ridge, X 2, 

 paratype, 111087a; (33) impression of the brachial interior, X 2, paratype, 

 111087b; (34) impression of another brachial interior showing slots produced 

 by elevated disk, X 3, paratype, 111087c; (35) plasticine replica of the brachial 

 interior, X 3, prepared from the preceding mold. 



Oranda formation, Guilford Springs, 2% miles southwest of Chambersburg, 

 Chambersburg (15') Quadrangle, Pa. 



Plate 194 

 Bilobia, Bimuria, Dactylogonia, Palaeostrophomena, Titanambonites 



A. Bimuria lamellosa ( Bassler ) 767 



(1) Brachial view of a complete specimen, X I, hypotype, 110948b; (2) brachial 

 view of a complete specimen, X I, lectotype, 66168a; (3-7) respectively brachial, 

 posterior, anterior, side, and pedicle views, X 2, of the lectotype; (8) pedicle 

 view, X 1, of a paratype, 66168b; (9, 10) posterior and full views of the brachial 

 interior, showing brachiophores and septa, X 2, hypotype, 110948! 



Oranda formation, along the railroad \ mile west of Strasburg, Strasburg 

 (15') Quadrangle, Va. 



B. Titanambonites amplus (Raymond) 718 



(11, 13-15) Respectively exterior, posterior, anterior, and side views of the pedicle 

 valve, X 1, hypotype, 117416; (16) interarea of preceding, X 2. 

 Arline formation, Knoxville, Tenn. 



