416 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
preserved to make a good comparison possible. Cherty marble in the lower 50 
feet of the Red Knobs formation, 3 miles southeast of Knoxville, Tenn. 
Valcourea sp. 4: A single poorly preserved specimen (110202) measuring 
18 mm. in length and 23 mm. wide, with fine costellae, strongly convex brachial 
valve having a sulcus extending nearly to the anterior margin, represents still 
another species. Costellae number 18 or Ig in 5 mm. at the front margin. The 
specimen is suggestive of . austrina but is more convex and more finely orna- 
mented. Arline formation, 1 mile southeast of Fowlers Mill, 10 miles southeast 
of Loudon, Loudon (30’) Quadrangle, Tennessee. 
Valcourea sp. 5: Another large species (116973a,b) similar to the preceding 
occurs in the Mountain Hill conglomerate of the Quebec City formation. It is 
19.4 mm. long and 24.6 mm. wide. The maximum concavity is in the median 
region, but the valve is not deeply concave. The fold extends from beak to an- 
terior margin. This is one of the largest Valcoureas yet seen but, of all those 
that have been described, is most suggestive of the Whistle Creek and Lincoln- 
shire specimens. 
Horizon and locality—Quebec City formation, 400 to 500 feet south of Morin 
Building, Mountain Hill, Quebec. 
Genus MULTICOSTELLA Schuchert and Cooper, 1931 
Multicostella ScHUCHERT and Cooper, Amer. Journ. Sci., vol. 22, p. 244, 1931; Mem. Peabody 
Mus. Nat. Hist., vol. 4, pt. 1, p. 98, 1932. 
MULTICOSTELLA BURSA (Raymond) 
Plate 64, C, figures 10-16 
Hebertella bursa RayMonp, Bull. Mus. Comp. Zool., Harvard Coll., vol. 68, No. 6, p. 294, 
pl. 1, fig. 7, 1928. 
Multicostella whitesburgensis Butts, Virginia Geol. Surv. Bull. 52, p. 67, pl. 80, figs. 14-17, 
1942. 
Shell of about the usual size or large for the genus, slightly wider than long 
with the greatest width at about the middle. Hinge narrower than the greatest 
shell width or about equal to the midwidth. Cardinal extremities acutely angu- 
lar to subalate. Lateral margins generally concave just anterior to the cardinal 
angie but broadly rounded anterolaterally; anterior margin broadly rounded. 
Anterior commissure rectimarginate to slightly uniplicate. Valves nearly equal 
in depth. Surface multicostellate ; valves marked by 70 to about 84 costellae that 
appear in 3 generations by implantation. 
Pedicle valve swollen in the midregion with moderately steep posterolateral and 
umbonal slopes but fairly gentle anterior slope. Umbonal region narrowly swol- 
len, with beak narrow and sharply produced posteriorly. Swollen umbonal re- 
gion continued anteriorly as an indistinct fold to about the middle. Anterior 
quarter to half bent gently in the direction of the brachial valve. Lateral profile 
with the greatest depth in the posterior half; the anterior profile forming a broad 
arch, Interarea of moderate length, strongly apsacline. 
