﻿1 194 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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C. Sowerbyella silicica nana Cooper, new subspecies 794 



(15-19) Respectively anterior, posterior, side, brachial, and pedicle views, X 2, of 

 the holotype, 98229a. 



Arline formation, Porterfield Quarry, 5 miles east of Saltville, Maccrady 

 (T.V.A. 218-N W) Quadrangle, Va. 



D. Sowerbyella silicica Cooper, new species 793 



(20-24) Respectively side, brachial, anterior, posterior, and pedicle views, X 2, of 

 the holotype, 117517a; (25, 26) pedicle and brachial views of a complete speci- 

 men, X 2, paratype, 117517b. 



Horizon and locality same as preceding. 



E. Sowerbyella bellarugosa Ulrich and Cooper 777 



(27) Exterior of the brachial valve, X 3, paratype, 92867a; (28) brachial interior 

 showing cardinalia and septa, X 6, paratype, 92867-I ; (29) exterior of the 

 pedicle valve, X 3, lectotype, 92867c 



Pogonip group (upper), about 1 mile above the mouth of Ikes Canyon, east 

 side Toquima Range, Roberts Mountains (i°) Quadrangle, New 



F. Sowerbyella perplexa Cooper, new species 790 



(30-34) Respectively anterior, side, posterior, pedicle, and brachial views of a 

 young specimen, X 2, paratype, 117508c; (39) brachial view, X 3, of preceding; 

 (38) pedicle view of a full-grown specimen, X 2, paratype, 117508c; (40) bra- 

 chial view of an imperfect specimen showing the ornamentation, X 3, paratype, 

 H75o8g; (41) exterior of a large brachial valve, X 2, paratype, H75o8f; (42) 

 interior of an imperfect pedicle valve showing muscle area, X 2, paratype, 

 H75o8d; (43) interior of an imperfect brachial valve, X 4, paratype, ii75o8i; 

 (44) another imperfect brachial interior showing the cardinalia, X 3, paratype, 

 117508b. 



Chatham Hill formation, 1.2 miles S. 31 ° E. of Sharon Springs, Burkes 

 Garden (15') Quadrangle, Va. 



(35-37) Anterior, brachial, and pedicle views of a well-preserved specimen, X 2, 

 holotype, 117509a. 



Chatham Hill formation, Grayson Farm, 4 miles southwest of Bland, Bland 

 County, Va. 



G. Sowerbyella sp. 3 803 



(45) Brachial view, X 1, of the figured specimen, 117546; (46-50) respectively 

 brachial, anterior, posterior, side, and pedicle views, X 2, of the preceding 

 specimen. 



Lower part dark shale under Eureka quartzite, north-facing nose of hill 8167, 

 Martins Ridge, Monitor Range, Roberts Mountains (i c ) Quadrangle, Nev. 



H. Sozverbyella compacta Cooper, new species 778 



(5i-54> 56) Respectively brachial, pedicle, anterior, posterior, and side views of a 

 complete specimen, X 2, paratype, 117484a; (55, 59) pedicle and brachial views 

 of another complete specimen, X 2, paratype, 117484b; (57, 58) interiors of two 

 brachial valves showing cardinalia and septa, X 3, paratypes, ii7484d, 117484c. 

 Benbolt formation, 0.9 mile northeast of Heiskell, Powell Station (T.V.A. 

 137-SE) Quadrangle, Tenn. 



Plate 197 

 Sowerbyella 



A. Sozverbyella negritus ( Willard) 788 



(1, 2) Pedicle and brachial views of a specimen showing the ornamentation, X 2, 

 hypotype, 117504a; (3) pedicle view of another specimen, X 2, hypotype, 

 117504c. 



