PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 571 
Type.—Holotype: 111127. 
Horizon and locality——Elway formation, (35 to 55 feet above base of section) 
in Tennessee: 4 mile northwest of Eidson, Kyles Ford (T.V.A. 170-SE) Quad- 
rangle. 
Discussion.—This species is distinguished from all others known by its elongate 
form, narrow posterior, multiplicate shell, and the inconspicuous character of the 
fold and sulcus, neither of which is strongly set off from the surrounding parts 
of the shell. It is suggestive of C. leiorhynchoidea but is more strongly costate. 
CAMERELLA ? LEIORHYNCHOIDEA Cooper, new species 
Plate 114, D, figures 39-43 
Shell of about medium size for the genus, all the specimens in a crushed state 
and simulating common Letorhynchus (now Nudirostra) ; valves of nearly equal 
depth and convexity. Surface completely costate except for beak region which is 
smooth. Costae narrowly rounded, low, irregular. Greatest width anterior to 
the middle. Interior of both valves with a long median septum. 
Measurements in mm.— 
Length Width 
Eigictype, (nedicle WAlVE) oa. oles dons tne sly daca 13.4 13.0 
Paratype (brachial Valve" 1x7138d) os «wees wc d+ te tay eks 10.8 10.4 
Types.—Holotype 117138a; figured paratypes: 117138b-d; unfigured para- 
types: 117138e-h. 
Horizon and locality—Edinburg formation (Liberty Hall facies), just below 
a siltstone with Paucicrura in Virginia: On the south side of U. S. Highway 33 
in pasture road, between Peales Crossroads and Penn Laird, about 5 miles south- 
east of Harrisonburg, Harrisonburg (15’) Quadrangle. 
Discussion.—The material on which this species is based is not well enough 
preserved to determine whether or not the genus is Camerella or Parastrophina. 
It is referred doubtfully to Camerella because that is the commoner genus in the 
Appalachians. The species can be recognized by its similarity to Letorhynchus 
limitare. 
CAMERELLA MINUTA Cooper, new species 
Plate 113, C, figures 10-19 
Shell small for the genus, subpentagonal in outline with the length and width 
about equal. Beak angle slightly less than 90°. Posterolateral margins straight ; 
lateral margins narrowly rounded with the greatest width located at about the 
middle. Anterior margin gently rounded. Surface costate in the anterior half, 
2 costae in the sulcus, 3 on the fold, and 3 or 4 on the flanks. Costae thick, 
rounded. 
Pedicle valve gently convex in lateral profile with the maximum convexity 
about one-third the length from the beak; anterior portion somewhat flattened. 
Posterior half somewhat swollen ; sulcus originating about 24 mm. anterior to the 
beak at about the middle of the valve, widening anteriorly to occupy slightly more 
