﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER II7I 



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 interior of an old brachial valve, X 3, showing thickened cardinalia, hypotype, 

 no896d. 



Athens formation (base), 600 feet S. 40° E. of the railroad-highway crossing 

 1 mile northeast of Athens courthouse, Athens (T.V.A. 125-NE) Quadrangle, 

 Tenn. 



Plate 167 

 Palaeostrophomena 



A. Palaeostrophomena rcsupinata Cooper, new species 704 



(1, 4) Brachial and posterior views, X 1, of a complete specimen, paratype, 

 111078c; (21) posterior of the preceding, X 2, showing chilidium and simple 

 cardinal process; (2, 3) brachial and side views, X 1, of another complete 

 specimen, paratype, ni078d. 



Benbolt formation (base), \ mile east of Speers Ferry, Clinchport (T.V.A. 

 188-NW) Quadrangle, Va. 

 (5-7) Brachial, side, and pedicle views of a small specimen, X i, paratype, 

 H7377d; (16, 17) posterior and brachial views, X 2, of the preceding; (8, 9) 

 another complete specimen, X h pedicle and brachial views, paratype, 117377a; 

 (19) posterior, X 2, of the preceding; (20) brachial view, X 2, of preceding; 

 (11-15) respectively side, brachial, pedicle, posterior, and anterior views of a 

 large complete specimen, X 1, holotype, 117377I1; (22, 23) respectively X 1 and 

 X 2 enlargements of the pedicle interior, showing genital markings, pallial sulci, 

 and muscle area, paratype, 117377 g; (24) another pedicle valve, X 3, showing 

 pallial marks, paratype, 117377c; (25) a third pedicle interior, X 2, paratype, 

 H7377e; (26) brachial interior, X 2, showing septa and pallial marks, companion 

 valve to preceding pedicle valve, paratype, H7377e; (27) brachial interior show- 

 ing 3 septa bundled anteriorly, X 2, paratype, H7377f ; (28) interior of an old 

 brachial valve, X 3, showing genital markings, pallial sinuses, and cardinalia, 

 paratype, 117377c, companion to pedicle valve fig. 24. 



Benbolt formation (lower), west slope of the hill \ mile east of Cedar Point 

 School, Hilton (T.V.A. 197-N W) Quadrangle, Va. 

 (10, 18) Pedicle and side views of a large specimen, X 1, paratype, 111069a. 



Benbolt formation, just east of meridian i7'3o", east of Moccasin Creek, north 

 edge of Mendota (T.V.A. 197-NE) Quadrangle, Va. 



Plate 168 

 Glyptambonites, Palaeostrophomena 



A. Glyptambonites glyptus Cooper, new species 713 



(1) Plasticine replica of the brachial interior, X 2, from paratype, 123248a; (2) 

 plasticine replica of the brachial exterior, showing also part of pedicle valve 

 attached, X 2, from paratype, 123248b. 



Botetourt formation, 2 miles northwest of Brownsburg, Lexington (15') 

 Quadrangle, Va . 



B. Palaeostrophomena angulata Cooper, new species 7 02 



(3) Exterior of the pedicle valve, X 2, holotype, 111080a; (4) interior of the 

 pedicle valve showing muscle area, pallial marks, and marginal indentations, X 2, 

 paratype, 11 1084; (5, 6) respectively X 2 and X 1 views of a wide pedicle valve 

 showing the interior, paratype, 111080b; (7) pedicle interior showing the 

 elongate diductor scars, X 2, paratype, 111080c; (8) another pedicle interior, 

 X 2, paratype, mo8od; (9, 10) pedicle valves retaining part of the brachial 

 valve near the beak, X 2, paratypes, mo8oe, mo8of. 



