Ig2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
road to Ceres near W. S. Waddles’ house, 8 miles southwest of Bland, Bland 
County. 
Red Knobs formation in Tennessee: Ross and Republic Quarry, 5 miles south- 
east of Knoxville. 
Discussion.—This species is based on two specimens from calcarenite lime- 
stone at two localities. Both specimens show the chevron arrangement of the 
elongate pustules in the umbonal region. Although both are exfoliated, details 
of the interior are not clear. The species is not related to Lingula=Palaeoglossa 
belli to which it was originally referred. The ornamentation distinguishes this 
species from all other known American Obolus. 
OBOLUS sp. 1 
Plate 8, D, figures 9-11 
Shell thin, of about medium size for the genus, transversely oval in outline. 
Greatest width located about two-thirds the length from the beak. Sides strongly 
rounded; anterior margin broadly rounded. Surface marked by fine, elevated 
concentric lines of growth. 
Pedicle valve bluntly pointed, the beak forming an angle of 110°. Lateral 
profile very gently convex, maximum convexity located at the umbo. Anterior 
slope gently arched and long. Anterior profile moderately convex with flat and 
moderately steep lateral slopes. Umbonal and median regions swollen. 
Brachial valve with outline similar to that of the pedicle valve but having a 
blunter and more rounded beak; greatest depth in the umbonal region. Lateral 
and anterior profiles gentle but similar to those of the pedicle valve. 
Measurements in mm.— 
Length Width 
Pedicle valve (LIO7GGd ys vc sags ane cree gee ts os 10.8 10+ 
Brachial Valve CLIOZOOC) tess ces cores Soe ee see eee as 10.5 12.0 
Figured specimens.—11678ga-c. 
Horizon and locality—Upper Table Head series, Port-au-Port, Newfoundland. 
Discussion.—This is a more transverse species than any described from 
younger rocks. 
OBOLUS sp. 2 
Plate 22, F, figures 12, 13 
Shell of about medium size for the genus, represented by a single brachial valve 
showing the interior and a counterpart thereof. Outline triangular with gently 
rounded sides and narrowly rounded anterolateral extremities. Anterior margin 
straight. Interior showing pallial marks and some of the muscle marks. Margin 
with fine depressions perpendicular to the shell margin; matrix along shell mar- 
gin on sides and anterior with a discolored margin showing hairlike marks sug- 
gesting setae. 
Measurements in mm.—Length 10.8, midwidth 8.8, widest part at front margin 
10.2. 
