414 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Types.—Holotype: 116971 ; figured paratypes: 116972b,d, 110277b; unfigured 
paratypes: 110277a,c,d, 116972a,c. 
Horizon and locality.—Lower Bromide (Mountain Lake member—small Val- 
courea bed) in Oklahoma: On Oklahoma Highway 99, 3 miles south of Fitts- 
town, Pontotoc County; top of zone 7, Rock Crossing of Hickory Creek, center 
sec. 35, 1.5 9., R. 1 E,,.Carter County; U. S. Highway.77, NE4 sec. 25,,T..2.5., 
R. 1 E., Carter County; Falls Creek, SWiNW4SW3 sec 33, T. 1 S., R. 2 E,, 
Murray County ; “reef” beds on west side Oklahoma Highway 18, 1.8 miles south 
of Sulphur, Murray County; 49 to 66 feet above the Bromide sandstone on 
Spring Creek, sec. 17, T. 2 S., R. 1 W., Murray County. 
Discussion.—This species is characterized by its transverse form and the fine 
costellate ornamentation. It is not like any of the Valcoureas of the Appalachians. 
It differs from V. deckeri in its generally smaller size and wider outline. 
VALCOUREA VENTRO-CARINATA (Butts) 
Plate 71, C, figures 10-14; plate 73, B, figures 5-14 
Strophomena ventro-carinata Butts, Alabama Geol. Surv., Special Rep. 14, pl. 16, figs. 16, 17, 
1926.—ScHUCHERT and Cooper, Mem. Peabody Mus. Nat. Hist., vol. 4, pt. 1, p. 97, 1932. 
Shell fairly large for the genus, subquadrate to subrectangular with the width 
slightly greater than the length; hinge forming the widest part; sides gently 
convex, oblique; anterior margin narrowly rounded; anterior commissure recti- 
marginate ; surface costellate, costellae closely crowded, about 13 in 5 mm. at the 
anterior margin. Costellae crossed by closely crowded, elevated concentric fila, 
about 12 to the millimeter. 
Pedicle valve fairly deeply concave with the most concave part in the anterior 
third; umbo prominently and sharply carinate; carina extended to the middle 
as a strong narrow fold, low and indistinct from the middle to the front margin. 
Areas bounding carina gently concave ; interarea strongly apsacline. 
Brachial valve strongly convex in lateral profile with the greatest convexity at 
about the middle; anterior profile fairly strongly convex but with the middle 
narrowly sulcate. Median region inflated; umbo somewhat flattened, sulcate ; 
sulcus narrow and deep in the posterior half, shallower anteriorly to the front 
margin but distinctly visible; flanks bounding sulcus inflated ; posterolateral and 
lateral slopes steep. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
Hypotype (117992a)........ 13.1 12.7 15.8 16.2 35 
5 CLIOZAG) > srestese orb 12.4 11.9 16.9 17.6 ? 3.5 
Types.—Lectotype: 71498a; figured paratype: 71498b; figured hypotypes: 
110246, 1179922. 
Horizon and locality.—Little Oak formation in Alabama: 4 mile north of Pel- 
ham on U. S. Highway 31, Bessemer Iron District (15’) Quadrangle; 4 mile 
south of Newala, Montevallo (15’) Quadrangle; Ragland Cement Company 
