PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 941 
conspicuous, narrow, low, and thin to absent. Delthyrial cavity shallow. Teeth 
small; dental ridges flaring, not reaching the middle of the muscle area. Inside 
the brachial valve muscle impressions and cardinalia confined to the posterior 
third ; cardinal process moderately large. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
ECE ABO. wi5/0 sidnaioieis uae s avelereve.s 26.8 24.3 30.4 33.6 4.4 
Paratype (O8201C) wi. .<caes 28.0 26.7 36.6 42.8 3.0 
Hypotype (117730b) ......... 26.1 ? 20.6 37.3 ? 
a CLI77304a)): bs Eke 25.2 23.7 2777 31.9 4.0 
Types.—Lectotype: 98201a; paratypes: 98201b,c; figured hypotypes: 
117730a,b, 117732a, 117733a, 117734a, 1177374. 
Horizon and locality.—Wardell formation and Wardell part of Dryden forma- 
tion in Virginia: 1 mile west of Rye Cove and several other points in the near 
vicinity of Rye Cove, Clinchport (T.V.A. 188-NW) Quadrangle; Route 19, 
Little Indian Creek, 24 miles west of Paint Lick, Richlands (15’) Quadrangle; 
top 40 feet on Virginia Highway 610 at the southwest base of Paint Lick Moun- 
tain, Pounding Mill-Richlands (15’) Quadrangles; quarry on Station Creek, 
4 mile south of U. S. Highway 58, 2 miles east of Cumberland Gap, Wheeler 
(T.V.A. 153-SE) Quadrangle ; Mannville School, Clinchport (T.V.A. 188-NW) 
Quadrangle. 
Same formations in Tennessee: On the north side of the road 1.1 miles north- 
east of Lee Valley, Lee Valley (T.V.A. 171-NW) Quadrangle; along the ridge 
just southwest of the old store near Hayes’ house, Evans Ferry section on 
U. S. Highway 25E, 4 mile north of Indian Creek, Howard Quarter (T.V.A. 
162-NW) Quadrangle; bend of the railroad just west of Liberty Hill, Dutch 
Valley (T.V.A. 154-SE) Quadrangle. 
Discussion.—This species is abundant in the Wardell formation and is charac- 
terized by strong costellae, strong ears on the cardinal extremities, and moderate 
convexity. The species differs from S. auburnensis nasuta in having less con- 
vexity and different ornamentation. The costellae are stronger than those of 
S. costellata and S. basilica. 
STROPHOMENA ? MILLIONENSIS AFFINIS Wilson 
Strophomena? millionensis affinis Witson, Trans. Roy. Soc. Canada, ser. 3, vol. 30, sec. 4, 
p. 135, pl. 1, fig. 5, 1945; Geol. Surv. Canada, Bull. 8, p. 104, pl. 9, fig. 5, 1946. 
Type.—Holotype: G.S.C. 7586. 
Horizon and locality—Leray (Chaumont)— Rockland beds in Ontario, 
Canada: On the Cobden-Eganville road. 
STROPHOMENA MINUTA Wilson 
Strophomena minuta Witson, Trans. Roy. Soc. Canada, ser. 3, vol. 39, sec. 4, p. 135, pl. 1, 
figs. 1-3, 1945; Geol. Surv. Canada, Bull. 8, p. 105, pl. 9, figs. 1-3, 1946. 
Type.—Holotype: G.S.C. 7616. 
Horizon and locality—Leray =Chaumont formation in Ontario, Canada: At 
Stewart Quarry, Rockland. 
