206 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Horizon and locality Columbiana formation in Alabama: 0.2 mile southeast 
of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion.—Small size and thin shell are the characteristics of this species. 
It differs from L. lirata Cooper, new species, from the Pratt Ferry formation 
from the same locality in size and shape. 
LINGULELLA VIRGINIENSIS Cooper, new species 
Plate 1, C, figures 4, 5 
Shell small, yellowish brown in color, subovate in outline. Beak approxi- 
mately a right angle ; lateral margins rounded ; anterior margin narrowly rounded. 
Valves unequally convex, the brachial one having the greater convexity. Sur- 
face ornamented by a few distant concentric lines and finer lines of growth. 
Pedicle valve nearly flat in lateral profile but gently convex in anterior profile. 
Slopes to the lateral margins steep at the posterior but becoming obsolete 
anteriorly. 
Brachial valve gently convex with the greatest convexity located slightly pos- 
terior to the middle. Lateral slopes steep posteriorly where the valve is some- 
what swollen medially, but becoming gentle anteriorly. Beak blunter than pedicle 
one. 
Measurements in mm.—Holotype (pedicle valve), length 6.8, brachial length 
6.5, width 4.0, thickness of complete specimen 1.6. 
Type.—Holotype: 109296. 
Horizon and locality—‘Ottosee formation” (probably Benbolt) in Virginia: 
1 mile west of Rye Cove, Clinchport (T.V.A. 188-NW) Quadrangle. 
Discussion.—The ornamentation will serve to distinguish this species before 
any of its other features. The distant concentric lines are like those of Plecto- 
glossa oklahomensis, but this is a smaller and narrower species. 
LINGULELLA sp. 1 
Plate 8, C, figures 6-8 
Black in color, narrowly elliptical in outline, length twice the width; greatest 
width at about the middle. Lateral margins gently curved, anterior and posterior 
extremities rounded. Ornamentation poorly preserved. Brachial valve deepest 
in the middle with long posterior and anterior slopes, the latter being the steeper. 
Anterior and posterior profiles narrowly convex with steep lateral slopes. 
Measurements in mm.—Length 18.3, width 8.9, thickness 2.4? 
Figured specimens.—116769a,c. 
Horizon and locality.—Dark limestone of Upper Pogonip group (Anomalor- 
this zone) in Nevada: Ikes Canyon, east side of Toquima Range, Roberts Moun- 
tains (1°) Quadrangle. 
LINGULELLA sp. 2 
Plate 5, B, figure 6 
Shell large for the genus, as shown by a single brachial valve; elongate oval 
in outline, length about 13 times the width. Maximum width slightly anterior 
