﻿TART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II I 5 



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 smaller than the preceding, X 4. paratype, 85422c; (21) brachial interior, 

 ca. X 6, showing cardinalia, paratype, 85422P. 



Salona formation (12 feet above the base), along the railroad beside Fishing 

 Creek, Salona, Clinton County, Lock Haven (15') Quadrangle, Pa. 



Plate 108 



Camerella, Glyptorthis, Idiospira, Oxoplecia, Perimecocoelia, 

 porambonites, taphrorthis 



A. Glyptorthis glypta Cooper, new species 369 



(1) Pedicle exterior, X 3, paratype, 116935c; (2, 3) respectively exterior and inte- 

 terior of a pedicle valve, X 4, showing muscle area and ornamentation, para- 

 type, 116935a; (4, 5) exterior and interior of the brachial valve, showing 

 cardinalia, X 4, paratype, 116935b. 



Pratt Ferry formation (lower third), 0.2 mile southeast of Pratt Ferry, 

 18 miles southwest of Montevallo, Blocton (15') Quadrangle, Ala. 



B. Taphrorthis peculiaris Cooper, new species 328 



(6-10) Respectively pedicle, posterior, anterior, side, and brachial views of a 

 young but complete specimen, X 4, paratype, 116893b; (11) brachial view of 

 a complete specimen, X 4, paratype, 116893a; (12, 13) respectively pedicle and 

 brachial interiors, X 4» of same paratype; (14) pedicle exterior, X 4, of the 

 same paratype. 



Horizon and locality same as preceding. 



C. Glyptorthis equiconvexa Cooper, new species 368 



(15, 16) Respectively X2 and X 1 views of the brachial interior, showing the 

 cardinalia, paratype, 116933b; (17, 18) respectively X I and X2 views of the 

 pedicle interior showing the narrow diductor tracks and the broad adductor 

 track, paratype, 116933a. 



Botetourt formation, in the field on the south side of the road 0.2 mile east 

 of Strasburg Junction, Strasburg (15') Quadrangle, Va. 



D. Taphrorthis peculiaris Cooper, new species 328 



(19, 20) Brachial and pedicle views of a somewhat crushed specimen, X I, 

 paratype, 11 6892. 



Botetourt formation, north side of Virginia Highway 114, 2.t> miles west of 

 the Montgomery-Roanoke County line, 12 miles northeast of Blacksburg, Va. 



E. Perimecocoelia semicostata Cooper, new species 594 



(21) Spondylium of the pedicle valve showing an anterior constriction common 

 to old-age specimens, X 4, paratype, 117159x1 ; (22) another fragmentary pedicle 

 valve showing the spondylium, in this case without constriction, X 3, paratype, 

 117159c; (23, 24) brachial interior in normal view and tilted to show the 

 elongated cruralium from which the genus derives its name, X 2, holotype, 

 117159b; (25) incomplete brachial valve seen from the side to show the elongated 

 cruralium and fulcral plates, X 3, paratype, 117159a. 

 Horizon and locality same as A above. 



F. Idiospira panderi (Billings) 691 



(26-30) Respectively brachial, pedicle, posterior, side, and anterior views of a com- 

 plete specimen, X 1, hypotype, 92374a; (31) brachial interior showing cardinalia, 

 X 2, hypotype, 85330a; (32) specimen with brachial valve removed to show 

 peculiar brachidium, X 2, hypotype, 92374c. 



Rockland formation, Pauquette Rapids, Ottawa River, Ontario, Canada. 



G. Camerella umbonata Cooper, new species 582 



(33. 34) Pedicle and brachial views of the holotype, X I, H7I47 5 (35-39) respec- 

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



