966 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
the brachial valve, and 2 strong fascicles bound the sulcus. Median fascicle of 
the pedicle valve forming a low fold; 4 distinct fascicles present on the lateral 
slopes flanking the median fascicle. 
Pedicle valve moderately convex in lateral profile with the maximum con- 
vexity located near the middle. Anterior profile narrowly rounded and with steep 
lateral slopes. Interarea apsacline, curved; beak incurved. 
Brachial valve moderately convex in lateral profile; gently convex in anterior 
profile and with the center slightly depressed at the sulcus. Sulcus originating 
at the umbo, deepest near the middle and becoming broad and shallow at the 
anterior. Flanks bounding sulcus slightly swollen. Slopes to the cardinal ex- 
tremities steep, slightly concave. Interarea moderately long, gently curved. 
Interior of pedicle valve with fairly well developed vascula media but poorly 
defined median elevation. Median ridge of brachial valve low; cardinal process 
not preserved, or rudimentary. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
EVONGEI DE is ns as soc ad os 8.0 a7 9.6 6.9 4.8 
Paratype (117279a).... 9.6 8.9 10.6 8.6 6.8 
Types.—Holotype: 117280a; figured paratypes: 117279a, 117280b,g; un- 
figured paratypes: 117279b-e, 117280c-f. 
Horizon and locality.—Little Oak formation in Alabama: At the intersection 
of the Bailey Gap and Cahaba Valley roads, SW4SW35 sec. 13, T. 19 S., R. 2 W., 
13 miles northeast of Newhope Church, Vandiver (15’) Quadrangle; 1 mile 
northeast of Pelham, 2 miles north of Pelham, on the west side of U. S. High- 
way 31, 4 mile north-northeast of Pelham, Bessemer Iron District (15’) Quad- 
rangle. 
Arline formation (middle) in Tennessee: On north side of wagon road in 
glade, + mile southeast of Friendsville, Concord (T.V.A. 138-SW) Quadrangle. 
Tellico formation in Tennessee: On Chapman Highway (Tennessee 71), 
1.3 miles east-northeast of Cusick, Walden Creek (T.V.A. 156-SW) Quad- 
rangle; BM-LHT 1366, 1 mile southeast of Chilhowee View School, Blockhouse 
(T.V.A. 148-NW) Quadrangle. 
Discussion.—This species is characterized by the strength of the fasciculation 
of its costellae. The fascicles are more regularly developed than in any other 
species described herein. 
PAURORTHIS FASCIFERA Cooper, new species 
Plate 140, D, figures 26-29 
Shell small, wider than long, with the greatest width slightly posterior to the 
middle. Sides gently rounded; anterior margin somewhat narrowly rounded; 
anterior commissure gently sulcate; fascicostellate, fascicles strong and promi- 
nent, generally consisting of 3 costellae. 
Pedicle valve gently convex in lateral profile with the greatest depth just an- 
terior to the umbo; anterior profile narrowly convex in the median region with 
