﻿IO96 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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D. Mimella transversa Cooper, new species 484 



(33-37) Respectively posterior, pedicle, side, brachial, and anterior views, X I, of 

 the holotype, 11 7052. 



Valcour formation, Valcour Island, Lake Champlain, Plattsburg (15') Quad- 

 rangle, N. Y. 



E. Mimella borealis (Billings) 469 



(38, 39) Brachial and pedicle views, X I, of the holotype, G.S.C. 1035c. 



St. Martin formation, Caughnawaga, La Prairie County, Quebec, Canada. 



F. Mimella imperatar (Billings) 475 



(40-43) Respectively posterior, pedicle, brachial, and side views of exfoliated 

 specimen, showing muscle impressions of the pedicle valve and the brachial 

 pallial impressions of two brachial interiors, X I, hypotype, Carnegie Mus. 5447. 

 Aylmer formation (Rockcliffe member), Aylmer, Quebec, Canada. 

 (44) Impression of the pedicle interior on sandstone, X l, hypotype, Carnegie 

 Mus. 5448; (45) impressions of two brachial interiors, X l, hypotype, Carnegie 

 Mus. 5447. 

 Horizon and locality same as preceding. 



Plate 86 

 Mimella 



A. Mimella extensa Cooper, new species 470 



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

 complete specimen, X I, paratype, 117037J ; (6) brachial exterior of a large but 

 somewhat crushed specimen, X I, paratype, 110669b; (7, 20) exterior and inte- 

 rior of a large pedicle valve, X I, paratype, 110662a; (21) same as preceding, 

 X 2, enlarged to show pallial markings and muscle scars; (8) pedicle exterior, 

 X 2, to show ornamentation of a young specimen, paratype, 1 17037! ; (9, 10) 

 brachial interior tilted to side to show brachiophore supports and in normal posi- 

 tion, X 2, paratype, 117037b; (11) brachial interior, X 1, paratype, H7037f; 

 (12, 13) same specimen as preceding, X 2, tilted to show brachiophore supports 

 better in normal view; (14) pedicle interior, X 1, paratype, 117037c; (15, 16) 

 same as preceding, X 2, tilted to show dental plates and teeth and in normal 

 view; (17) exterior, X 2, of preceding. 



Bromide formation (Mountain Lake member), road cut on Oklahoma High- 

 way 99, SWiNWiSWi sec. 12, T. 1 N., R. 6 E., Pontotoc County, Okla. 

 (18, 19) Exterior and interior views of a pedicle valve doubtfully referred to this 

 species, X I, figured specimen, 1 10663. 



Bromide formation (Mountain Lake member), along creek in SW^ sec. 27, 

 T. 2 S., R. 3 E., i{ miles west and |- mile south of Nebo, Murray County, Okla. 



Plate 87 

 Mimella 



A. Mimella ulrichi Cooper, new species 486 



(1-5) Respectively brachial, posterior, side, anterior, and pedicle views, X 2, of 

 the holotype, 1 10805. 



Crown Point formation, Sloop Bay, Valcour Island, Lake Champlain, Platts- 

 burg (15') Quadrangle, N. Y. 



B. Mimella nucleoidea Cooper, new species 480 



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

 plete specimen, X 1, holotype, 110786; (11) brachial view, X 2, of holotype; 

 (12, 13) brachial interior in normal position and tilted to show the brachiophore 



