562 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Brachial valve gently convex in lateral profile but with a strongly inflated 
umbo; anterior profile broadly but strongly convex. Median region inflated, fold 
originating at the middle, narrow, strongly elevated. Flanks swollen, narrowly 
rounded, and depressed. Interior with sessile cruralium, short median ridge, and 
small adductor field. 
Measurements in mm.— 
Brachial Hinge 
Length length Midwidth width Thickness 
Holotype (brachial valve)........ ? 73 0.2 1.9 2.2? 
Paratype (pedicle valve 117154a). 6.1 ? 0.4 2.0 2.0? 
Types——Holotype: 117154c; figured paratypes: 117154a,b. 
Horizon and locality About 3 feet above the base of the Pratt Ferry forma- 
tion in Alabama: 0.2 mile southeast of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion.—No other species of this genus is known to which B. camerata 
may be compared. 
Family CAMERELLIDAE Hall and Clarke, 1804 
Biconvex, narrow-hinged Syntrophiacea having a small cruralium duplex in the 
brachial valve ; interareas reduced or obsolete. 
Subfamily CAMERELLINAE Hall and Clarke, 1894 
Camerellidae having a spondylium simplex in the pedicle valve. 
Genus CAMERELLA Billings, 1859 
Camerella Brttincs, Canadian Nat., vol. 4, p. 301, 1859. 
Rhynchocamara SCHUCHERT and Cooper, Mem. Peabody Mus. Nat. Hist., vol. 4, pt. 1, p. 180, 
1932. 
CAMERELLA ANTEROPLICATA Cooper, new species 
Plate 111, F, figures 46-54; plate 111, G, figures 55-63 
Shell of about medium size for the genus, slightly wider than long and with 
the greatest width at about the middle; outline forming a depressed oval; pos- 
terolateral margins straight, directed obliquely and forming an angle slightly 
more than go°. Sides narrowly rounded; anterior margin broadly rounded; 
anterior commissure strongly uniplicate. Posterior half of shell smooth, anterior 
half costate with 2 to 3 costae on the flanks, 3 to 4 on the fold, and 2 to 3 in the 
sulcus. 
Pedicle valve less deep than the brachial valve; gently convex in lateral pro- 
file with the maximum convexity slightly posterior to the middle; anterior pro- 
file broadly and gently convex ; umbonal and median regions moderately inflated ; 
sulcus short and shallow, originating just anterior to the middle; tongue short, 
serrate; flank bounding sulcus moderately swollen. Costa bounding sulcus 
stronger and more elevated than the others. Beak short, incurved, protruding 
slightly posterior to the brachial umbo. 
Brachial valve fairly strongly and evenly convex in lateral profile and with 
