PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 579 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
Efototyne tet: figs da O84. 05.4 10.0 0.5 9.0 32 7.2 
Paratype Ga1r46b).....04...... 9.4 9.3 9.0 3.0 7.6 
= (ratia6e)...644.. 2... 10.0 9.5 9.3 3.2 UA 
Types —Holotype: 111146a; figured paratypes: 85340a, 111146b,c, 118012; 
unfigured paratypes: 85340b, 111146d,e. 
Horizon and locality—Ridley formation in Rutherford County, Tenn.: 
C. St. L. and N. RR., 34 miles northwest of Murfreesboro; Murfreesboro ; Nice’s 
(Ward’s) Mill on Stone River, 8 miles (airline) northwest of Murfreesboro, 
34 miles northwest of Murfreesboro. 
Discussion.—This species is characterized by its seminude exterior, the pos- 
terior half being without ornamentation but the anterior half strongly costate, 
and the shell generally elongate. It is strongly suggestive of C. edmundsoni in 
its elongate form, but the latter species is nearly completely costate. Its elongate 
form distinguishes C. pulchra from any of the Elway Camerellas except C. mul- 
tiplicata, but that species is more finely and numerously costate. 
CAMERELLA QUADRIPLICATA (Willard) 
Plate 111, B, figures 16-26 
Camarotoechia quadriplicata WILLARD, Bull. Mus. Comp. Zool., Harvard Coll., vol. 68, No. 6, 
p. 291, pl. 2, fig. 14, 1928. 
Shell of about medium size for the genus, subtriangular to subpentagonal in 
outline, length and width approximately equal; beak angle about 100°, defined 
by slightly concave posterolateral margins; anterolateral extremities narrowly 
rounded, situated in the anterior third, and forming the greatest shell width. 
Anterior margin slightly rounded. Surface costate, 2 to 4 costae in the sulcus, 
3 to 5 on the fold, and 5 or 6 on the flanks. Costae and interspaces covered by 
a felt of small granules. 
Pedicle valve moderately convex in lateral profile and slightly convex in an- 
terior profile. Sulcus originating about 4 mm. anterior to the beak in front of 
a gently convex umbo. Sulcus, widening anteriorly to occupy very slightly more 
than half the width at the front margin. Tongue short and abruptly truncated 
anteriorly. Flanks flattened adjacent to the sulcus but narrowly rounded at the 
margins to form steep posterolateral slopes. Delthyrium narrow, beak not elon- 
gated. Spondylium deep. 
Brachial valve moderately convex and with a well-rounded umbo in lateral 
profile ; narrowly convex and deeper than the pedicle valve in anterior profile. 
Umbo slightly swollen; fold low and gently rounded in profile. Flanks mod- 
erately depressed below the fold, well rounded and with steep lateral slopes. 
Interior with spondylium and cruralium as usual in the genus. 
