568 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Measurements in mm.—Holotype, length 14.5, brachial length 13.4, width 16.4, 
thickness 10.3. 
Types——Holotype: 111119d; figured paratypes: 98220a, I11119b,c; unfigured 
paratypes: 98220b, I11119a; figured specimen: 117133a. 
Horizon and locality—tLincolnshire formation in Virginia: At Marcem 
Quarry, 2 miles west of Gate City, Gate City (T.V.A. 188-NE) Quadrangle. 
Lincolnshire formation in Tennessee: On the north side of the road, 2 miles 
southwest of Hall Crossroad, Fountain City (T.V.A. 146-SW) Quadrangle. 
Discussion.—Large size, completely costate surface, and great width are the 
features that serve to distinguish this shell from all others known. In its large 
number of costae it is suggestive of C. multicostata but is larger and of different 
proportions. Other described forms of such large size, such as C. gregeri and 
C. volborthi, are generally only partially costate. 
This species is more strongly costate and more deeply sulcate than C. costel- 
lata from the Elway formation, which it resembles in outline and profile. It is 
distinguished from C. globularis, which it resembles in profile, by its more finely 
ornamented exterior and greater width. 
Inside the brachial valve of one specimen the brachiophores are preserved in 
their entirety, proving to be long and slender processes extending in the direc- 
tion of the brachial valve. 
CAMERELLA GLOBULARIS Cooper, new species 
Plate 116, B, figures 6-20; plate 116, C, figures 21-24 
Camarella sp. Butts, Virginia Geol. Surv. Bull. 52, p. 45, pl. 74, figs. 1-7, 1942. 
Shell of about medium size for the genus, transversely subelliptical in outline, 
and globular in profile. Sides strongly rounded, beak approximately a right 
angle. Surface of posterior third smooth, anterior two-thirds marked by 14 to 
16 broadly rounded costae separated by spaces less wide than the costae. From 
I to 4 costae occupy the sulcus, and 4 to 5 mark the fold; flanks marked by 4 
to 5 costae. Spondylium wide and deep. 
Pedicle valve evenly and moderately convex with the maximum convexity 
at about the middle; sulcus originating at about the middle of the valve, shallow, 
and occupying somewhat more than half the valve width. Tongue short and 
truncated. Flanks moderately rounded in profile and with steep slopes. 
Brachial valve considerably deeper than the pedicle one, strongly convex in 
lateral and anterior profile and with greatest convexity at the middle. Umbonal 
and posterior region swollen; fold originating at about the middle, low and 
rounded in profile. Flanks moderately rounded and with steep slopes. Brachial 
interior with small cruralium. 
Measurements in mm.— 
Brachial 
Length length Width Thickness 
EIRP ce ies ce eee an cn Coote 13.3 12.6 14.8 11.8 
Paratype (GotG@a) ss... .0t ere ee wee 12.2 10.8 12.4 0.6 
