PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 779 
Brachial valve moderately concave with the most concave portion between 
the umbo and the middle; posterolateral areas deflected and flattened. Areas 
bounding deepest concave portion only gently convex. Median sulcus reaching 
the margin in some specimens, in others the anterior portion distinctly flattened. 
Interarea hypercline. 
Pedicle interior with large, subflabellate, widely divergent adjustor-adductor 
impressions; median septum short, forked. Interior thickened and with deeply 
impressed pallial marks. Brachial valve with much thickened and wide periph- 
eral border ; median septa low, ending at about middle of valve where they are 
moderately elevated. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness Height 
FGLoty Ne tAtleitees.ci4 6.9 6.6 10.2 DTT 1.4 2.0 
Paratype (117487b)... ? 6.7 9.3 g.1 ? ? 
y (IL74AS7C)-. 7.0 7 10.5 10.7 1.8 2.5 
* (117487d)... 7.8 a3 10.5 II.I 2.0 2.2 
s (117487e) ..... 6.9 6.6 9.9 10.3 1.8 2.1 
ie CUTZAS7i) ee) 7.0 6.5 9.4 0.3 1.8 1.9 
ss (117489a)... 7.8 7.4 11.9 12.4 1.8 2.9 
ms (117486a)... 7.2 6.6 Ei.2 12.5 1.6 2.2 
si (117486c)... 6.6 6.3 10.0 11.7 3 24 
rf (117484a)... 6.0 5.6 8.2 8.7 1.5 1.8 
ic (117484b)... 7.2 6.6 9.0 9.5 23 2.6 
% (117483b)... 8.4 ? 12.0 12.6 ? 2.5 
* (aI7483a ys Pr 8.0 12.8 14.3 ? ? 
“ (117483f) ... 8.3 ? 12.4 133 ? 2.4 
is CELZAS IO ican vite? 8.1 12.8 12.6 ? ? 
5 (117490).... 8.6 8.0 12.3 12.8 ? 1.9 2.5 
Types.—Holotype: 117487a; figured paratypes: 117483b,c, 117484a-d, 
117485a,b, 117486a-c, 117487b, 117490; unfigured paratypes: 117482, 117483a, 
d-f, 117487c-i, 117489a. 
Horizon and locality —Benbolt formation in Virginia: 1 mile west of Rye Cove, 
second cut west of McDavid’s house; 0.3 mile north-northwest of the Memorial 
School, Rye Cove; at the Brick Church 14 miles west of Rye Cove; 1 mile west 
of Rye Cove; Clinchport (T.V.A. 188-NW) Quadrangle. 0.2 mile south of the 
middle fork of Moccasin Creek, 14 miles due south of Hansonville, Hansonville 
(T.V.A. 205-SW) Quadrangle; north side of U. S. Highway 19, 13 miles south- 
east of Hansonville Post Office, Brumley (T.V.A. 205-SE) Quadrangle; east 
bank of sinkhole 300 feet south of Lakeview Church, on Virginia Highway 71, 
Moll Creek (T.V.A. 196-SE) Quadrangle. 
Dryden formation in Tennessee: Lone Mountain, 1 mile west of Lone Moun- 
tain, and 14 miles northeast of Lone Mountain, Tazewell (T.V.A. 154-NE) 
Quadrangle; Tennessee Highway 53 at Nicely and Palmer’s store, 4 mile east 
of Kate, Maynardville (30’) Quadrangle. Roadside 0.9 and 1.6 miles northeast 
of Heiskell; road corner 4 mile southwest of Fleanor Mill, Powell Station 
(T.V.A. 137-SE) Quadrangle. West side of sharp loop of the road down Flint 
