438 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
east of Murfreesboro, Rutherford County; Rutherford Creek, 4 miles north of 
Columbia, Maury County; near Clifton, Wayne County. 
Carters formation in Alabama: At a quarry 4 mile north of Gate City, Leeds 
(15’) Quadrangle. 
Camp Nelson formation in Kentucky: At High Bridge, Harrodsburg (30’) 
Quadrangle. 
Discussion.—This species has a very strong resemblance to Campylorthis, but 
not one of the numerous specimens in the collection has shown any trace of a 
pseudodeltidium. The generally small size, fairly deeply concave pedicle valve, 
and strongly convex brachial valve will help to place it. It resembles C. super- 
lata from Georgia, but that is a larger and more coarsely costellate species. It 
also resembles C. rectangulata from the Wardell formation in the Evans Ferry 
section but differs in having a more concave pedicle valve and less swollen 
brachial valve. 
CHAULISTOMELLA MAGNA (Schuchert and Cooper) 
Plate 70, B, figures 11-23 
Dinorthis subquadrata DECKER (not Hall), Oklahoma Geol. Surv. Bull. 55, pp. 42, 46, pl. 13, 
fig. G, 1931. 
Valcourea magna SCHUCHERT and Cooper, Mem. Peabody Mus. Nat. Hist., vol. 4, pt. 1, 
p. 98, pl. 10, figs. 16, 20, 27-29, 1932. 
A large and robust species characterized by its size and beautiful ornamenta- 
tion. Shell subquadrate in form and having the valves unequally convex, the 
pedicle valve very gently convex while the brachial valve is moderately convex. 
Fold low and poorly defined, from the beak to the front margin, but, as usual in 
dinorthids, best defined on the posterior half. Flanks of shell bounding the fold 
flattened or gently depressed. 
Brachial valve much deeper than the pedicle valve and moderately convex in 
lateral profile. Sulcus very shallow over its whole length but best defined at the 
posterior half. Flanks bounding sulcus gently swollen. Interareas nearly of the 
same length, the brachial one, however, slightly the shorter. Surface multicostel- 
late, the costellae low and rounded, with unequal interspaces. Scattered primary 
costellae often swollen and enlarged. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
Hypotype (110539c)........ 26.8 272 34.6 33.0 13.0 
- (BIOGAS Ye has crates 25.8 26.0 34.0 31.9 12.3 
Types.—Holotype: Y.P.M. (Schuchert coll.) 5779; figured hypotypes: 
110539c, 110543a, 110545, 116999b; unfigured hypotypes: 110539a,b, 110543b-d, 
1169992. 
Horizon and locality—Bromide formation (Pooleville member—O-roplecia 
gouldi zone) in Oklahoma: Rock Crossing of Hickory Creek, about center sec. 
25, T.5 S., R. 1 E., Criner Hills, Carter County; West Spring Creek, east of 
Pooleville, Murray County. 
