﻿1202 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 



Page 



D. Sowerbyclla punctostriata (Mather) 792 



(14, 15) Respectively X 1 and X2 views, showing ornamentation, of a topotype, 

 II7SI6. 



Rockland formation, Wolfe Island, Lake Ontario between Kingston and Cape 

 Vincent, N. Y. 



E. Sowerbyella monilifcra Cooper, new species 785 



(16, 17, 21, 22, 25) Respectively pedicle, brachial, posterior, side, and anterior 

 views of a complete specimen, X 2, holotype, 117500b; (18) enlargement of the 

 central portion of the brachial valve, X 4, of the holotype; (19, 20) respectively 

 X 1 and X 2 views of a paratype, 117500a; (23, 24) pedicle and brachial views 

 of a complete specimen showing growth stages, X 2, paratype, 117500c; (26) 

 interior of the pedicle valve showing muscle scars, X 2, paratype, H75oog; 

 (27, 28) interior of the same brachial valve, X 2 and X 4, showing cardinalia, 

 paratype, H750oi. 



Decorah formation (Ion member), 1.1 miles east of U. S. Highway 52, south 

 edge of Cannon Falls, Goodhue County, Minn. 



Plate 207 

 eoplectodonta 



A. Eoplectodonta f dubia Cooper, new species 810 



(1) Somewhat exfoliated pedicle exterior, X 2, paratype, 11 0984. 



Edinburg formation (Cyrtonotella zone), ravine on south side railroad, \ mile 

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



B. Eoplectodonta alternata (Butts) 808 



(2) Pedicle view of a young specimen, X 4, hypotype, 1 10985. 



Oranda formation, along the railroad \ mile west of Strasburg, Strasburg 

 (15') Quadrangle, Va. 



(3) Exterior of the pedicle valve, X 1, hypotype, H755iq; (4-7) respectively pos- 

 terior, anterior, side, and pedicle views, X 2, of the preceding specimen; (8, 9) 

 exterior and posterior views of another pedicle valve showing ornamentation, 

 X 1, hypotype, 111798a; (10, 11) posterior and full views of the preceding 

 pedicle valve, X 2, showing the ornamentation; (12-14, 25) anterior, brachial, 

 posterior, and side views of a complete specimen, X 1, hypotype, ii755od; 

 (15, 16) brachial and pedicle views of the preceding specimen, X 2, showing 

 the ornamentation; (17) posterior of the brachial view of the same specimen, 

 X 3, showing pseudodeltidium and alternating character of the ornamentation ; 

 (18) brachial view of another complete specimen, X 2, showing ornamentation 

 and the interareas, hypotype, 117550b; (19) exterior of pedicle valve showing 

 anterior folds, X', hypotype, 117551-I; (20, 21) posterior and anterior views 

 of the brachial interior, X2 , showing septa, cardinalia, and pallial marks, hypo- 

 type, H755ig; (22, 23) posterior and anterior views of another brachial interior 

 showing the septa, X 3, hypotype, 11755m; (24) posterior view of another 

 brachial interior showing the septa, X 2, hypotype, 111798b. 



Martinsburg formation (part with Brongniartella and referable to the Salona 

 formation), on Virginia County Highway 617 = 910, 0.15 mile north of Green 

 Mount Church, Broadway (15') Quadrangle, Va. 



Plate 208 



Eoplectodonta, Leptaena 



A. Eoplectodonta alternata (Butts) 808 



(1, 2) Exterior and tilted view of a large pedicle valve, X 2, hypotype, 79419a; 



