PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 257 
TORYNELASMA Cooper, new genus 
(Greek toryne, spoon; elasma, plate) 
Small, acutely conical in profile; surface marked by fine concentric lines. 
Pedicle valve with acute apex and minute apical foramen; pseudointerarea 
not clearly marked; intertrough narrow, shallow, indistinct. 
Brachial valve convex in lateral profile; median septum originating a short 
distance anterior to the posterior margin and surmounted by a long, shallow, 
spoonlike plate. Median hinge region with a short, shelflike plate overhanging 
space between posterior end of spoon and posterior margin. 
Genotype.—Torynelasma toryniferum Cooper, new species. 
Discussion.—In its exterior features, particularly its profile, this genus is like 
several others but is characterized by the extremely sharp beak. The spoon- 
shaped plate on the median septum is, as far as known, unique. 
TORYNELASMA MINOR Cooper, new species 
Plate 18,1, figures 57-64 
Shell minute, conical, pale yellow to brown in color, and marked by fine con- 
centric lines. 
Pedicle valve forming a fairly symmetrical cone with strongly oblique open- 
ing; beak acute; apical angle between 30° and 40°; anterior margin gently 
sinuate. 
Brachial valve nearly circular in outline ; lateral profile gently convex ; anterior 
sulcate ; posterior moderately swollen. Interior with a short, erect, spoon-shaped 
plate set on a high median septum, both structures originating near the posterior 
margin ; septum highest near the middle of the valve and not protruding anterior 
to the anterior end of the spoon-shaped plate but extending as a sharp point 
anterior to the anterior end of the spoon. Spoon-shaped plate short and flat. A 
small circular muscle platform appears on each side of the thin posterior end of 
the median septum. 
Measurements in mm.— 
Height 
of 
spoon 
Length Width Thickness plate 
Holotype (brachial valve) ....... 0.6 0.70 ? 0.4 
Paratype (pedicle valve 116823d).. 0.64 0.75 1.06 ? 
Types.—Holotype: 116823a; figured paratypes: 116823b-d; unfigured para- 
types : 116823e-h. 
Horizon and locality.—Pratt Ferry formation (lower 3 feet) in Alabama: 0.2 
mile southeast of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion—This species differs from the preceding one in its smaller size 
and the character of the spoon-shaped plate in the brachial valve. In this species 
the plate is flatter, shorter, and more elevated than in T. toryniferum. Further- 
more, the septum is quite different in this species in having its own pointed crest 
anterior to the spoon-shaped plate, the anterior end of which is unsupported. 
