﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II99 



Page 

 septa, X 2, paratype, 117542b; (23) pedicle interior showing Y-shaped ridge and 

 muscles, X 2, paratype, 117542c 



Bromide formation (Mountain Lake member), \ mile west of U. S. High- 

 way 77, SWi sec. 25, T. 2 S., R. 1 E., Carter County, Okla. 



D. Sowerbyella indistincta Cooper, new species 782 



(24) Pedicle interior, X 2, paratype, 117493b; (25) pedicle exterior, X 2, holo- 

 type, 117493a; (26) slab showing interiors of three pedicle valves and a brachial 

 exterior, X 2, paratype, 117493c. 



Bromide formation (Mountain Lake member), about the middle of sec. 33, 

 T. 2 S., R. 2 E., about 2 miles northeast of Springer, Carter County, Okla. 



E. Sowerbyella variabilis Cooper, new species 798 



(27) Brachial view of a small specimen showing aberrant fasciculation of costellae, 

 X 1, paratype, 117538a; (28, 29) brachial and pedicle views, X 2, of the preced- 

 ing specimen; (30) brachial view of the same specimen, X 4, showing the bun- 

 dling of costellae; (31, 32) pedicle and brachial views of a specimen preserving 

 the attenuate cardinal extremities, X 2, paratype, 117536a; (33) brachial view 

 of a complete specimen, X 1, holotype, 117536b; (34-38) respectively anterior, 

 posterior, pedicle, side, and brachial views, X 2, of the holotype. 



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. 



(39. 4°) Two brachial interiors, X 2, showing cardinalia and septa, paratypes, 

 H7535b and II7535C. 



Bromide formation (Pooleville member — 370 to 390 feet above base), creek 

 bed just west of U. S. Highway 77, north of culvert near store, SE^NE^ sec. 25, 

 T. 2 S., R. 1 E., Carter County, Okla. 



Plate 203 

 eoplectodonta, sowerbyella 



A. Sowerbyella plicatifera Cooper, new species 791 



(1) Brachial view of a complete specimen showing the folds which inspired 

 the specific name, X 1, paratype, 117512a; (2, 3) pedicle and brachial views, 

 X 2, of the preceding specimen; (7) brachial view of a complete specimen, X l» 

 holotype, 117512b; (8-11) respectively brachial, posterior, anterior, and side 

 views, X 2, of the preceding specimen; (12) brachial view of another complete 

 specimen, X 1, paratype, 117511a; (4-6, 13, 14) respectively posterior, anterior, 

 side, brachial, and pedicle views, X 2, of the preceding specimen; (15) enlarge- 

 ment of the ornamentation of the brachial valve, X 6, of the preceding specimen. 

 Bromide formation (Mountain Lake member), Decker's section, zone 3, at 

 Nebo, Murray County, Okla. 



B. Eoplectodonta ? triradiata (Butts) 812 



(16-18) Two pedicle views and side view of a partially exfoliated specimen, X 2, 

 hypotype, 123257a; (19) immature specimen not yet geniculated, X 2, holotype, 

 97582b; (20) somewhat larger specimen than the preceding but not geniculated 

 to the extent shown by specimen figured in 16-18, X 2, paratype, 97582a. 



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

 burg (15') Quadrangle, Va. 



C. Sowerbyella cava Cooper, new species 777 



(21-24) Respectively posterior, pedicle, brachial, and side views of a nearly per- 

 fect specimen, X 3, paratype, 117480a; (25, 26) pedicle and anterior views of 

 a well-preserved pedicle valve, X 2, paratype, 123258a; (27) brachial view of 



