PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 529 
KULLERVO SULCATA Cooper, new species 
Plate 99, B, figures 15-18 
Known from pedicle valve only. Minute, hemipyramidal as usual in the genus, 
strongly suggestive of K. ornata but differing in having a much deeper median 
sulcus, bounded by a strongly elevated costella. Outside each bounding costella 
and inside the posterior margin is a fascicle of 3 or 4 costellae. Area between 
fascicle and posterior margin concave and marked by strong, elevated concentric 
lines. Spondylium broad and shallow; septum short. 
Measurements in mm.—Holotype, length 2.4, hinge width 3.9. 
Type.—Holotype: 117017. 
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. 
Superfamily TrIPLESIACEA Cooper, 1944 
Impunctate brachiopods having a flat pseudodeltidium, small apical foramen 
in the pedicle valve, brachial valve with a long, forked cardinal process. 
Family TRIPLESIIDAE Quenstedt, 1931 
Characters same as those for the superfamily. 
This family makes its first appearance in the Table Head series in the form 
of Onychoplecia. The small size and generalized form of these little shells are 
in keeping with the characters of an early stock. At the present time it is not 
possible to suggest a possible progenitor. The family and superfamily characters 
are all clearly developed in the earliest genus, but no indication is given by that 
form of primitive characters that might relate it to brachiopods of the early 
Ordovician. 
ONYCHOPLECIA Cooper, new genus 
(Greek onychos, claw; plekos, plaited) 
Shell small, tear-shaped in outline, narrowly lenticular in profile; valves un- 
equally convex, the brachial valve having the greater depth. Anterior commis- 
sure uniplicate; fold of brachial valve usually short and in some species indis- 
tinct. Surface marked by concentric lines of growth only. Shell substance fibrous, 
impunctate, 
Pedicle valve tear-shaped in outline, often with the beak elongated and slender ; 
profile gently convex; delthyrium covered by a flat pseudodeltidium marked 
along its center line by a more or less narrow fold; foramen apical, small; in- 
terior marked by long, diverging dental plates; other details not known. 
Brachial valve subcircular in outline and strongly convex in profile; chilidium 
small, elongate, subtriangular ; cardinal process with stout shaft, forked distally, 
the prongs of the fork bearing the myophores. Other details of the interior 
unknown. 
Genotype.—Onychoplecia brevirostris Cooper, new species. 
