FART «E CHAZYAN AND RELATED BRACHIOPODS—COOPER 261 
Types.—Holotype: 116819a; figured paratypes: 116819b-h, unfigured para- 
type: 116820. 
Horizon and locality —The Pratt Ferry formation (lower 3 feet) in Alabama: 
0.2 mile southeast of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion.—No other species of this genus is available for comparison. 
EPHIPPELASMA Cooper, new genus 
(Greek ephippium, saddle; elasma, plate) 
Shell minute, elongate conical in profile, surface marked by fine concentric 
lines. 
Pedicle valve elongate conical with apex curved in a posterior direction; 
foramen minute, apical; pseudointerarea wide; intertrough indistinct; anterior 
margin with slight sinuation. Interior not showing muscle scars. 
Brachial valve gently concave, sulcate ; interior with a large complicated saddle- 
shaped plate originating about one-third the length anterior to the posterior mar- 
gin ; saddle-shaped plate bearing several prongs along its anterior borders, gen- 
erally 5 in number. Hinge region with a small shallow triangular pit and narrow 
propareas. 
Genotype.—E phippelasma minutum Cooper, new species. 
Discussion—No known genus is comparable to Ephippelasma. The only 
genus known with a structure of the brachial valve similar to that of Ephip- 
pelasma is Prototreta Bell, but in that Middle Cambrian genus the median plate 
is constructed entirely differently. 
EPHIPPELASMA MINUTUM Cooper, new species 
Plate 17, A, figures 1-14 
Shell minute, elongate conical in outline with the posterior side flattened ; sur- 
face marked by crowded, fine, concentric lines. 
Pedicle valve forming a misshapen cone in lateral profile with the posterior 
side gently concave and the anterior side broadly convex; in anterior profile 
the sides of the cone equal and slightly convex; anterior margin with a slight 
emargination ; apical angle about 40°. Pseudointerarea broad with a faint nar- 
row intertrough; beak incurved, foramen at the apex, minute. 
Brachial valve with a nearly straight and wide hinge; roundly elliptical in 
outline; later margins somewhat narrowly rounded; anterior margin broadly 
rounded ; lateral profile nearly plane; anterior profile gently concave medially ; 
median region of valve more or less deeply concave; umbonal region somewhat 
narrowly swollen; beak small, protruding slightly posterior to the posterior mar- 
gin. Sulcus broad and shallow, extending from anterior side of umbo to front 
margin. Interior as described for the genus. 
Measurements in mm.— 
Height 
of 
dorsal 
Length Width Thickness plate 
Paratype (pedicle valve 116821d).. 0.6 0.75 0.9 ? 
1 (brachial valve 116821f). 0.6 0.9 ? 0.6 
