﻿1072 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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D. Hesperorthis sulcata Cooper, new species 356 



(22, 23) Brachial interior, X 2 and X 1, showing long brachiophores, paratype, 

 109987a; (24-28) respectively posterior, anterior, side, brachial, and pedicle 

 views, X2 , of the holotype, 109987b; (29-32) respectively brachial view Xi 

 and X 2, pedicle view, X 1, and posterior view, X 2, of a large, complete speci- 

 men with attached cluster of Skenidioides, paratype, I09987d; (33, 35) brachial 

 and posterior views of a complete specimen, X 1, paratype, 1099926; (34, 36) 

 brachial and anterior views, X 2, of same. 



Bromide formation (Pooleville member — Oxoplecia gouldi zone), branch of 

 Hickory Creek, NW| sec. 26, T. 5 S., R. 1 E., Criner Hills, Carter County, 

 Okla. 

 (37) Brachial exterior, X 2, of a young specimen, showing sulcus and ornamenta- 

 tion, paratype, 109994b. 



Bromide formation (Pooleville member — Oxoplecia gouldi zone), Rock Cross- 

 ing of Hickory Creek, about center sec. 35, T. 5 S., R. 1 E., Criner Hills, Carter 

 County, Okla. 



Plate 53 

 Hesperorthis 



A. Hesperorthis anstralis Cooper, new species 345 



(1, 2) Respectively interior and exterior of a large brachial valve, X I, paratype, 

 116912a; (3-5) respectively lateral, interior, and exterior views of the pedicle 

 valve, X 1, paratype, 116912c; (28) posterior of pedicle valve showing pseudo- 

 deltidium and lateral plates, X 2, paratype, 116912b. 



Wardell formation (Hesperorthis bed), north quarry on Station Creek, £ mile 

 south of U. S. Highway 58, 2 miles east of Cumberland Gap, Wheeler (T.V.A. 

 153-SE) Quadrangle, Va. 

 (6-9) Respectively brachial, pedicle, side, and posterior views of a complete speci- 

 men, X 1 holotype, 109927a; (19) posterior view of a complete specimens, X 3, 

 paratype, 109927b. 



(10) Well-preserved pedicle valve, X I, paratype, 109928a; (26) posterior portion 

 of an old individual showing thickened cardinalia, X 3, paratype, I09928f. 



Wardell formation, on old Tennessee Highway 33 between Big and Little 

 Barren Creeks, Powder Springs (T.V.A. 154-SW) Quadrangle, Tenn. 



(11) Brachial exterior of a small specimen, X I, paratype, 116909a; (12, 13, 14) 

 respectively pedicle, side, and brachial views, X 2, of same; (15-18) respectively 

 interior, posterior, side, and partial side views of the brachial interior to show 

 brachiophores, X 2, paratype, n6909d; (24) brachial interior of another speci- 

 men showing long brachiophores, X 2, paratype, 116909c; (27) pedicle interior 

 showing muscle scars and pseudodeltidium, X 2, paratype, 116909b. 



Ridley formation (lower third), Marshall Knobs, 5 miles south of Murfrees- 

 boro, Murfreesboro (15') Quadrangle, Tenn. 

 (20-22) Respectively brachial, side, and posterior views of a complete individual, 

 X I, paratype, 71965b. 



Wardell formation, Clinch River, 12 miles northeast of Liberty Hill, probably 

 Howard Quarter (T.V.A. 162-NW) Quadrangle, Tenn. 

 (23) Pedicle interior, showing pseudodeltidium, X 2, paratype, 109906c; (25) 

 brachial interior, X 2, paratype, i099o6g; (29) brachial interior, X 3, showing 

 thickened cardinal process, paratype, ioo9o6i; (31) brachial interior, X 3, show- 

 ing accessory muscle attachments at base of cardinal process, paratype, 109906b. 

 Ridley ? = Wardell formation, on U. S. Highway 27, 1 mile north of Rock 

 Spring, Nickajack Gap (T.V.A. 113-SW) Quadrangle, Ga. 



