﻿1 172 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



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 Botetourt formation, cut at the junction of Virginia Highways 311 and 114, 

 \ mile west of Catawba, Salem (15') Quadrangle, Va. 



C. Palaeostrophomena subtransversa Cooper, new species 707 



(11-13) Pedicle, side, and brachial views of a complete specimen, X h the holo- 

 type, mo65g; (14-16) pedicle, brachial, and posterior views, X 2, of the holo- 

 type; (17) brachial view of another complete specimen, smaller than the holo- 

 type, X 2, paratype, 1110651 ; (18) pedicle interior showing pallial and muscle 

 marks, X 2, paratype, 111065c; (19) another pedicle interior, X 2, showing good 

 development of the pallial marks, paratype, 111065b; (20) brachial interior, X 2, 

 showing median septa and cardinalia, paratype, 111065I1; (21) another brachial 

 interior showing median septum, notothyrial thickening, and pallial marks, X 3, 

 paratype, mo65f; (22) posterior of a brachial valve showing narrow chilidium 

 and simple cardinal process, X 3, paratype, 111065J ; (23) another brachial inte- 

 rior, X 2, showing pallial marks, paratype, 111065c. 



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

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



Plate 169 

 isophragma, palaeostrophomena, sowerbyites 



A. Isophragma subabbreviatnm Cooper, new species 738 



(1) Brachial view, X I, of the holotype, 110916a; (2, 3) posterior and brachial 

 views, X 3, of the holotype; (4) brachial interior, X 3, of the holotype; (5) 

 interior of a fragmentary pedicle valve showing anterior thickenings and pseudo- 

 deltidium, X 3, paratype, 110916b; (6) brachial interior, X 3, showing median 

 ridge, holotype ; (7) same view of the same specimen, X 3, tilted to show ante- 

 rior edge of median ridge; (8) posterior of the brachial valve of the holotype, 

 X 4, showing the cardinal process and sockets; (9) cardinalia of the brachial 

 valve, X 4, of the holotype. 



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

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



B. Sowerbyites triseptatus ( Willard) 730 



(10) Brachial view of a complete specimen, X 2, hypotype, 117414b; (11) brachial 

 interior, X 2, showing characteristic median septum, hypotype, 117414a; (12) 

 pedicle interior showing callosities at anterior end of long diductor scars, 

 X 2, hypotype, 117414c. 



Lincolnshire formation (Hogskin member), U. S. Highway 25E, north of 

 Thornhill, Avondale (T.V.A. 162-SW) Quadrangle, Tenn. 



C. Palaeostrophomena superba Cooper, new species 706 



(13) Exterior of a pedicle valve, X 2, paratype, 117380. 



Arline formation, 1 mile northeast of Friendsville, Louisville (T.V.A. 

 138-SE) Quadrangle, Tenn. 



(14, 16) Pedicle and brachial views of a complete specimen, X 2, paratype, 

 mo7of ; (17) brachial view, X I, of the preceding; (15, 18) pedicle and bra- 

 chial views of a specimen larger than the preceding, X 2, holotype, 111070m; 

 (19, 27-29) brachial, posterior, anterior, and side views, X I, of the holotype; 

 (20-22) respectively X 1, X 2, and X 3 views of the pedicle interior showing the 

 muscle and pallial marks, paratype, 111070-I; (23, 24) pedicle interiors, X 2, 

 showing the pallial marks, paratypes, 111070P, ni07oi; (25, 26) fragments of 

 the brachial valve showing septum, X 2, paratypes, mo7oh; Iii070g. 

 Horizon and locality same as A above. 



