﻿1230 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 ornamentation; (19, 20) respectively Xi and X2 enlargements of a pedicle 

 exterior showing wrinkles on the posterior margin, paratype, 117799c; (23, 24) 

 respectively X 1 and X 2 enlargements of the brachial interior, paratype, 

 H7799d; (25) another brachial interior showing obscure ridges, the muscle 

 scars, and cardinalia, X 2, paratype, 117799c 

 Horizon and locality same as B above. 



Plate 243 

 Opikina 



A. Opikina extensa Cooper, new species 908 



(1-4, 7) Respectively pedicle, brachial, anterior, side, and posterior views of an 

 alate form, X 1, holotype, 123268b; (5, 6) pedicle and brachial views of another 

 specimen with outlines restored, X 1, paratype, 123268a; (8) ornamentation of 

 the pedicle valve, X 4, of the preceding specimen. 



Bromide formation (Pooleville member), 3 miles northeast of Springer, Carter 

 County, Okla. 



B. Opikina formosa Cooper, new species 909 



(9-13) Respectively pedicle, brachial, posterior, anterior, and side views of a small 

 but complete specimen, X 1, paratype, 123270a; (14, 15) pedicle and brachial 

 views of a larger specimen, X I, paratype, 123271a; (16, 17) brachial and 

 pedicle views of a specimen larger than the preceding two, X 1, paratype, 

 123269b. 



Bromide formation (Pooleville member — Oxoplecia gouldi zone), Spring 

 Creek, NJ sec. 17, T. 2 S., R. 1 W., Murray County, Okla. 



C. Opikina formosa Cooper, new species 909 



(18-22) Respectively posterior, anterior, side, pedicle, and brachial views of a 

 nearly perfect specimen, X 1, holotype, 123272a; (28) brachial valve, X 2, of 

 the holotype; (27) part of the ornamentation of the pedicle valve, X 4, near 

 the beak of the holotype; (23) interior of the brachial valve showing thickened 

 subperipheral rim and cardinalia, X 2, paratype, 123272b. 



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

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

 (24) Interior of the brachial valve showing septal ridges, X 1, paratype, 1 17808; 

 (25, 26) posterior and interior views, of the same brachial valve showing the 

 cardinal process and septal ridges, X 2. Note accessory tooth in socket. 



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

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

 County, Okla. 



Plate 244 

 Opikina 



A. Opikina parvida Cooper, new species '. 915 



( I_ 3, 5) Respectively side, posterior, pedicle, and anterior views of a complete 

 specimen, X 1, holotype, 117823a; (6-8) brachial, side, and pedicle views, X 2, 

 of the preceding specimen. 



Benbolt formation, 5 miles northwest of Wytheville, Wythe County, Va. 

 (4, 9) Respectively X. 1 and X2 enlargements of the brachial view of another 

 complete specimen, paratype, 117822a. 



Benbolt formation, Green Valley Church, 3 miles southwest of Lebanon, 

 Brumley (T.V.A. 205-SE) Quadrangle, Va. 



B. Opikina pulchella Cooper, new species 916 



(10-13) Respectively posterior, side, brachial, and anterior views, X h of the holo- 



