﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER I23I 



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 type, 117825a; (14-16) pedicle, side, and brachial views, X 2, of the holotype. 



Benbolt formation (base), 0.2 mile south of the middle fork of Moccasin Creek, 

 \\ miles due south of Hansonville, Hansonville (T.V.A. 205-SW) Quadrangle, 

 Va. 



C. Opikina transversa Cooper, new species 921 



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

 complete specimen, X 1, holotype, 117844a; (22) pedicle view of a complete 

 specimen showing posterolateral wrinkles, X I, paratype, 98226a; (27) brachial 

 view of a complete specimen, X 2, paratype, 98226b; (28) enlargement of part 

 of the brachial valve, X 4, of the preceding specimen; (29) pedicle exterior, X 2, 

 paratype, 117843d. 



Wardell formation, Lloyd Carter's barn, 0.8 mile by road northeast of Rye 

 Cove School, Clinchport (T.V.A. 188-NW) Quadrangle, Va. 

 (23) Pedicle view of a young and wide specimen, X I, paratype, 117846a; (24) 

 brachial view of an individual without alate points, X 1, paratype, 117846c; 

 (25, 26) pedicle and brachial views of a young specimen showing the orna- 

 mentation, X 2, paratype, 117846b; (30) brachial interior showing thickened 

 rim, and cardinalia, X 2, paratype, ii7846d; (31, 32) posterior half and poste- 

 rior view of the preceding brachial interior showing the cardinal process in 

 detail and the socket tooth well developed, X 4, paratype, 123276a. 



Wardell formation, second road cut west of L. McDavid's house, 1 mile west 

 of Rye Cove, Clinchport (T.V.A. 188-NW) Quadrangle, Va. 



Plate 245 

 Glyptomena, Opikina 



A. Glyptomena parvida Cooper, new species 883 



(1) Exterior of a pedicle valve, X 1, paratype, H7855g; (2, 4) exterior and inte- 

 rior of the preceding specimen, X 2, showing the muscle scars; (3) exterior of 

 an imperfect brachial valve showing the ornamentation, X 2, paratype, 117855b ; 

 (5, 6) respectively X 2 and X 1 enlargements of a brachial interior, showing the 

 septal ridges and cardinalia, holotype, 117855c; (7, 8) respectively X2 and X 1 

 enlargements of the brachial interior, showing cardinalia, paratype, 117855^ 



Effna-Rich Valley formations, Porterfield Quarry, 5 miles east of Saltville, 

 Maccrady (T.V.A. 218-NW) Quadrangle, Va. 



B. Opikina inquassa ( Sardeson) 912 



(9-12) Respectively posterior, anterior, side, and brachial views of a complete 

 specimen, X 1, hypotype, 24206. 



Decorah formation (Guttenberg member — Stictopora bed), Minneapolis, Minn. 



C. Opikina matntina Cooper, new species 913 



( I 3 _I 7) Respectively anterior, posterior, pedicle, brachial, and side views of a 

 complete specimen, X 1, holotype, 117817a; (18, 19) pedicle and brachial views, 

 X 2, of the holotype; (20) pedicle interior showing muscle area, X 2, paratype, 

 117817b. 



Arline formation, locality same as A above. 



D. Opikina minnesotensis (N. H. Winchell) 914 



(21) Exterior of the pedicle valve showing ornamentation, X 2, hypotype, 45277a; 



(22) exterior of the pedicle valve showing wrinkles along posterior margin, X 2, 



hypotype, 45277c; (25) interior of the brachial valve, X 2, showing muscle 



scars, hypotype, 45277b. 



Platteville formation (McGregor member), Minneapolis, Minn. 

 (23, 24) Respectively X 1 and X 2 enlargements of a pedicle interior showing 



the muscle scars, hypotype, 24708a; (27, 28) respectively X 1 and X2 enlarge- 



