﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER IO7I 



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D. Hesperorthis virginiensis Cooper, new species 359 



(19, 20) Pedicle and brachial views of a complete specimen, X l, paratype, 97598. 

 Oranda formation (lower part), on County Road 777 just west of its junction 

 with County Road 617 = 910, about i mile north of Greenmount Church, about 

 4 to 5 miles north of Harrisonburg, Broadway (15') Quadrangle, Va. 



E. Hesperorthis concava Cooper, new species 348 



(21-25) Respectively anterior, pedicle, side, posterior, and brachial views, X i. 

 holotype, 83842 ; (26) brachial view, X 2, of same. 



Platteville formation (McGregor member), quarry on south side of Ellenboro 

 Hill, about half way between Lancaster and Platteville, beside the main road 

 a short distance north of the bridge, Lancaster (30') Quadrangle, Wis. 



F. Hesperorthis ignicula (Raymond) 352 



(27) Inner filling showing brachial interior impression and part of the pedicle 

 interior, X 2, hypotype, 109925a; (28) plasticine replica of the brachial interior, 

 X 2, prepared from the preceding impression; (34) plasticine replica of the 

 brachial exterior, X 2, prepared from specimen 109925b. 



Valcour formation, on New York Highway 22, 1 mile southeast of Beekman- 

 town, Rouses Point (15') Quadrangle, N. Y. 



(29, 30) Respectively pedicle and brachial views of a complete specimen, X I> 

 lectotype, Carnegie Mus. 5453; (31, 32) pedicle and side views of a smaller com- 

 plete specimen, X 1, paratype, Carnegie Mus. 5527; (33) pedicle view, X 2, of 

 preceding. 



Valcour formation, Valcour Island, Lake Champlain, Plattsburg (15') Quad- 

 rangle, N. Y. 



Plate 52 



Hesperorthis 



A. Hesperorthis longirostris Cooper, new species 352 



(1, 7) Pedicle and brachial exteriors, X 1, paratype, 116920c 



Whistle Creek formation, on U. S. Highway 60, 100 yards southeast of 

 Whistle Creek, 2 miles northwest of Lexington, Lexington (15') Quadrangle, 

 Va. 

 (2-5) Respectively brachial, pedicle, side, and posterior views, X l> of the 

 holotype, 98180a; (6) brachial interior, X 2, paratype, 1099341. 



Whistle Creek formation, along Whistle Creek, ij to 2 miles northwest of 

 Lexington, Lexington (15') Quadrangle, Va. 



B. Hesperorthis crinerensis Cooper, new species 350 



(8, 9) Brachial and pedicle views, X 1, of a complete specimen, holotype, 110004a; 

 (10-14) respectively anterior, brachial, side, posterior, and pedicle views, X 2, of 

 the same specimen; (15) brachial interior, X 2, paratype, 110004b. 



Bromide formation (Mountain Lake member — middle of zone 7 of Decker), 

 Rock Crossing of Hickory Creek, about center sec. 35, T. 5 S., R. 1 E., Criner 

 Hills, Carter County, Okla. 



C. Hesperorthis tricemria ( Conrad) 358 



(16) Posterior view, X 2, of a pedicle valve showing pseudodeltidium and lateral 

 plates, hypotype, 109982a. 



Barnhart formation, on the old road 1 mile northwest of the Chicago Summer 

 School Camp, NWiSW* sec. 32, T. 37 N., R. 9 E., Weingarten (15') Quad- 

 rangle, Mo. 

 (17-21) Respectively anterior, posterior, pedicle, side, and brachial views of a 

 complete specimen, X I, hypotype, 24752a. 



Decorah formation (Guttenberg member), Platteville, Mineral Point (30') 

 Quadrangle, Wis. 



