PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER IOO!I 
costellation, and a shorter interarea and more erect beak. This species is rare 
in Oklahoma. 
FASCIFERA STONENSIS (Safford) 
Plate 152, B, figures 14-30 
Orthis stonensis SAFFoRD, Geol. Tennessee, p. 286, 1860. 
Dalmanella stonensis (Safford) Hatt and Crarke, Pal. New York, vol. 8, pt. 1, p. 224, 
pl. 5C, figs. 4, 5, 1892—Butrs, Alabama Geol. Surv., Special Rep. 14, p. 126, pl. 31, 
fig. 16, 1926. 
Shell large for the genus, slightly wider than long, with well-rounded lateral 
and anterior margins. Valves subequal in depth. Hinge narrower than the 
greatest width which is located at or near the middle. Surface marked by fine, 
narrow, elevated costellae of unequal size, the larger ones forming the center of 
more or less distinct fascicles which are best developed on the brachial valve. 
Costellae of first and second generations swollen. Spaces between costellae 
coarsely punctate. 
Pedicle valve very gently convex in lateral profile, broadly convex in anterior 
profile, and with median region slightly carinate. Beak prominent, umbo sub- 
carinate with carination continued anterior to the middle of the valve. Anterior 
portion only slightly folded. Umbonal slopes steep in the posterior part of valve, 
flat in profile. Interarea moderately long, gently concave, moderately apsacline. 
Brachial valve slightly more convex in lateral profile than the pedicle valve 
and with the greatest convexity posterior to the middle. Anterior profile broadly 
and moderately convex. Sulcus originating at the beak, narrow, moderately 
deep in the posterior half, becoming wider and shallower anteriorly. Sulcus in 
posterior third occupied by 2 costellae. Additional costellae implanted near the 
middle on the outside and inside of the original 2; 2 primary costellae forming 
the nucleus of 2 fascicles bounding the sulcus. Areas adjacent to sulcus moder- 
ately swollen. Slopes to cardinal extremities moderately steep, slightly convex 
in profile. 
Interior of pedicle valve with diamond-shaped area. Brachial interior with 
stout brachiophore supporting plates bounding a thickened notothyrial floor. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
Hypotype (pedicle valve 118082a)..... 12.8 ? 13.4 7.8 3.1 
ce (brachial valve 117309g).... ? 11.8 13.9 ? 1.8 
i: Gipyaioa) MNT... sete «de. 15.6 14.7 16.7 10.6 8.0 
Types——Figured hypotypes: 117309b,¢,g, 117310a, 117311a,b, 117312a, 
118082a-c. 
Horizon and locality—Wardell and Dryden formations in Tennessee: 14 
miles northeast of Loyston, Maynardville (30’) Quadrangle; 30 feet above the 
marble on the road along Little Sycamore Creek, $ mile northeast of the west 
edge of the Howard Quarter (T.V.A. 162-NW) Quadrangle; about 2 miles 
northeast of Tazewell; Flint Creek, southwest of Walker Branch on west side 
of sharp loop, Powder Springs (T.V.A. 154-SW) Quadrangle. 
