﻿1234 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. \2"J 



Plate 249 



Macrocoelia, Opikina, Rhipidomena 



Page 



A. Opikina speciosa Cooper, new species 918 



(1-5) Respectively anterior, posterior, brachial, side, and pedicle views of a com- 

 plete specimen, X 1, holotype, 117835a; (6, 7) respectively X 1 and X 2 enlarge- 

 ments of the pedicle interior showing the muscle area, paratype, 11 7833d; 

 (8, 9) respectively X 1 and X 2 enlargements of the brachial interior show- 

 ing septal ridges and cardinalia, paratype, 117835b. 



Ridley formation (Hesperorthis zone), on Tennessee Highway 28, 0.6 mile 

 south of Chappel Hill Methodist Church, 1 mile south of junction of Tennessee 

 Highways 8 and 28, Sequatchie Valley, Sequatchie County, Daus (T.V.A. 

 104-SE) Quadrangle, Term. 



B. Macrocoelia duplistriata ( Willard) 893 



(10-12) Brachial, posterior, and pedicle views of a complete but young specimen, 

 X 1, hypotype, 1 17769. 



Lincolnshire formation (upper), 0.75 mile southwest of Mount Eager Church, 

 0.2 mile north-northwest of the road, Hogskin Valley, Powder Springs (T.V.A. 

 154-SE) Quadrangle, Tenn. 



C. Rhipidomena mesleri Cooper, new species 868 



(13) Pedicle view of a small but complete specimen, X l> paratype, 1 17676; 

 (14-17) respectively brachial, anterior, side, and pedicle views of a large speci- 

 men, X 1, paratype, 117675a. 



Lincolnshire formation (Hogskin member), Sally Cleveland Farm, f mile 

 southwest of Washburn, Dutch Valley (T.V.A. 154-SE) Quadrangle, Tenn. 



Plate 250 

 Rhipidomena 



A. Rhipidomena mesleri Cooper, new species 868 



(1, 2) Respectively X 1 and X 2 enlargements of the pedicle interior showing the 

 broadly flabellate muscle scars, paratype, H7678g; (3, 5) brachial and pedicle 

 views of a complete specimen, X 1, paratype, 117678a; (6) pedicle view of 

 the preceding specimen, X 2, showing the ornamentation; (10) enlargement of 

 preceding, X 4, to show ornamentation in greater detail; (4, 7) respectively X 1 

 and X 2 views of the interior of a pedicle valve showing muscles and anterior 

 subperipheral rim, paratype, 117678c; (8, 12, 13, 14) respectively brachial, poste- 

 rior, side, and anterior views of a large and complete specimen, X 1, holotype, 

 117678b; (11) enlargement X 2, of the preceding; (9) interior of a large 

 brachial valve showing cardinalia and muscle scars, X 2, paratype, 117678^ 



Lincolnshire formation (Hogskin member), north of Hayes' house, Evans 

 Ferry section, along U. S. Highway 25E, 1 mile north of Indian Creek, Howard 

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



Plate 251 

 Rhipidomena 



A. Rhipidomena subparallela Cooper, new species 870 



(1-5) Respectively posterior, anterior, side, pedicle, and brachial views of a com- 

 plete specimen, X 1, holotype, 1 17679; (6, 7) pedicle and brachial views of a 

 small specimen, X 1, paratype, 117680a; (8-10) side, pedicle, and brachial views 

 of another complete specimen, X l, paratype, 117681a; (11, 12) pedicle and 

 brachial views of a complete specimen, X I, paratype, 117681b. 



