﻿1 174 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 12J 



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 type, 1 1 091 2; (3, 4) brachial and pedicle views of a young specimen, X 2, para- 

 type, H09o8g; (5, 6) respectively X 2 and X 1 views of a pedicle valve, para- 

 type, iiooo8d; (8, 9) respectively X2 and X3 enlargements of the interior of 

 the preceding specimen; (7) exterior of another pedicle valve, X 3, paratype, 

 110908c; (10, 11) respectively X2 and X3 enlargements of the brachial inte- 

 rior, showing median ridge and thick-shafted cardinal process, paratype, 110908a; 

 (12, 14) interior of two young brachial valves showing duplex character of 

 septum before it is thickened and grown together, X 3, paratypes, 110908b, 

 1 I0908h. 



Arline formation (middle), north side of wagon road in glade, i mile south- 

 east of Friendsville, Concord (T.V.A. 138-SW) Quadrangle, Tenn. 



B. Glyptambonites musculosus Cooper, new species 715 



(15) Plasticine replica of the pedicle interior showing the complicated pallial 

 sinuses and the elongate diductor muscles, X I, prepared from paratype, 117390a. 



Oranda formation, 0.6 mile northeast of Linville Station, Broadway (15') 

 Quadrangle, Va. 



C. Isophragma extensum Cooper, new species 735 



(16) Brachial view of a complete specimen, with outline restored, X 1, paratype, 

 110909a; (17-19) side, pedicle, and brachial views of the preceding specimen, 

 X 2, with outlines restored. 



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

 (T.V.A. 218-NW) Quadrangle, Va. 



D. Isophragma biseptatum Cooper, new species 734 



(20) Brachial view, X 1, of the holotype, 110905a; (21-23) pedicle, side, and 

 brachial views, X 2, of the holotype; (24, 25) pedicle and brachial views of an- 

 other complete specimen, X 2, paratype, 110905c; (26, 27) respectively X 1 and 

 X2 enlargements of a pedicle interior, paratype, 117373a; (28) another pedicle 

 interior, X 2 , showing subperipheral thickenings, paratype, 110905b; (29) bra- 

 chial interior, X 2, showing median ridges and cardinalia, paratype, uogosd. 

 Benbolt formation (40 feet above base), Green Valley, \ mile southeast of 

 Green Valley Church, 3 miles southwest of Lebanon, Brumley (T.V.A. 205-SE) 

 Quadrangle, Va. 



E. Isophragma biseptatum Cooper, new species 734 



(30) Brachial view of a complete specimen, X 2, paratype, 117374b; (31) impres- 

 sion of the brachial interior, X 2, paratype, 117374a; (32) plasticine replica of 

 the brachial interior, X 2, prepared from the preceding mold, showing the 

 median septa. 



Botetourt formation, south side of U. S. Highway 60, 1 mile northwest of 

 Lexington, Lexington (15') Quadrangle, Va. 



Plate 172 

 Hesperonomiella, Pauctcostella, Ptychoglyptus, Taffia 



A. Pauctcostella canadensis Cooper, new species 712 



(1) Exterior of a pedicle valve, X 2, paratype, 117395a; (2) exterior of a fairly 

 sulcate pedicle valve, X 2, holotype, 117395b; (3) another pedicle valve, X 2, 

 paratype, 117395c; (4) exterior of the brachial valve, X 2, paratype, H7395d; 

 (5) a wide pedicle valve, X 2 , paratype, H7395f; (6) brachial exterior, X 2 , 

 paratype, 117395c 



Boulder in Mystic conglomerate, Range 6, Lot 21, 2.6 miles north and \ mile 

 east of Mystic, Stanbridge Township, Quebec, Canada. 



B. Ptychoglyptus ? kindlei Cooper, new species 816 



(7) Pedicle exterior, X 2 , paratype, 117392a; (8) plasticine replica of the brachial 



