﻿PART II CHAZYAN AND RELATED BRACHIOPODS — COOPER 1203 



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 (3) side view of a complete specimen, X i» hypotype, 794190!; (6, 7) two views 

 of an impression of the pedicle interior, X 2, showing the muscle scars, hypotype, 

 794i9e; (18) exterior of a small pedicle valve, X 4. hypotype, 79419^ (14) 

 brachial interior, X 2, showing 3 septa, hypotype, 7941 9g. 



Oranda formation, % mile west of Strasburg along the railroad, Strasburg 

 (15') Quadrangle, Va. 



(4) Plasticine replica of a complete specimen seen from the brachial side, X 2, 

 hypotype, 110993c; (5) plasticine replica of the exterior of a large brachial 

 valve, X 2, hypotype, 110993d; (8) impression of the pedicle interior showing 

 the muscle scars and the pallial marks extending anteriorly, X 2, hypotype, 

 U0993f; (9) another pedicle interior impression showing muscle scars and 

 pallial marks, X 2, hypotype, 110993c ; (10, 11) respectively X 1 and X2 en- 

 largements of an impression of the pedicle interior showing the muscle scars and 

 the pallial marks extending anteriorly, hypotype, 110993a; (12, 13) another 

 impression of the pedicle interior in full view and tilted to show the muscle 

 scars, X 2, hypotype, H0993g; (15, 16) plasticine replica of the brachial inte- 

 rior showing the muscle scars, 3 septa, and denticles along the hinge and the 

 mold from which the cast was prepared, X 2, hypotype, 110993b; (17) plas- 

 ticine replica of the brachial interior showing cardinalia and septa, X 2, 

 hypotype, 110993b. 



Oranda formation, north side of road, 0.6 mile northwest of Linville Station, 

 Broadway (15') Quadrangle, Va. 

 B. Leptaena ordovicica Cooper, new species 820 



(19, 20) Side and exterior views of a pedicle valve, X 1, paratype, 1 17666; (21) 

 exterior view, X 2, of the preceding specimen. 



Martinsburg formation (Sinuites zone), Carlisle, Carlisle (15') Quadrangle, 

 Pa. 



Plate 209 



e0plect0d0nta, goniotrema, soweebyites 



A. Eoplectodonta joerstei Cooper, new species 811 



( 1 ) Immature pedicle valve, X 2, showing wrinkles along the posterior margin, 

 paratype, H0992d; (2, 3) respectively Xi and X2 enlargements of a pedicle 

 valve, holotype, 110992a. 



Wells formation, along the railroad i| miles southwest of Cumberland City, 

 Stewart County, Term. 



B. Sozverbyites triseptatus (Willard) 730 



(4, 5) Respectively X 1 and X 2 enlargements of the pedicle interior showing the 

 callosities at the anterior ends of the diductor scars, hypotype, 117413a; (6, 7) 

 respectively X 2 and X 1 enlargements of the brachial interior, showing the 

 median septum, hypotype, 117413b. 



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

 of Thorn Hill, Avondale (T.V.A. 162-SW) Quadrangle, Tenn. 



C. Eoplectodonta ? dubia Cooper, new species 810 



(8) Impression of the pedicle interior, X 2, paratype, 117555b; (9) impression of 

 the brachial interior, X 2, paratype, H7555f; (10) plasticine replica of the 

 brachial interior, X 2, prepared from the preceding; (11) another plasticine 

 replica of the brachial interior, X 2, showing septa, paratype, ii7555g; (12) 

 plasticine replica of the pedicle exterior, X 2, holotype, H7555d; (13) plasticine 

 replica of the brachial exterior of a small specimen, X 2, paratype, 117555b. 



Botetourt formation, junction Virginia Highways 731 and 724, 2 miles north- 

 west of Brownsburg, Lexington (15') Quadrangle, Va. 



