208 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Figured specitmen.—109307a. 
Horizon and locality—Arline formation in Tennessee: North side of wagon 
road in glade, 4 mile east of Friendsville, Concord (T.V.A. 138-SW) Quad- 
rangle. 
LINGULELLA sp. 6 
Plate 2, B, figures 6, 7 
About medium size for the genus, length about 14 times the width; sides 
gently curved, subparallel; anterior margin broadly curved; anterolateral ex- 
tremities somewhat narrowly curved; posterior margin forming an angle of 
about 110°. Beak anterior to posterior margin. Surface with concentric, ele- 
vated growth lines crowded on the posterolateral extremities but more distant 
and somewhat more regularly spaced on the median region. Specimens somewhat 
crushed, making it impossible to describe the profiles accurately. The two speci- 
mens available are brachial valves. 
Figured specimen.—109322. 
Horizon and locality——Aylmer formation (Rockcliffe member) in Canada: 
Aylmer, Province of Quebec. 
LINGULELLA sp. 7 
Plate 8, F, figure 14 
Shell small for genus, shiny brown in color, represented by the pedicle valve 
only. Outline oval, posterior end acutely angular, apical angle about 80°. Lateral 
margins gently curved; anterior margin strongly and broadly curved; lateral 
profile gently convex but with anterior and posterior profiles fairly strongly con- 
vex. Umbonal region strongly convex with steep lateral slopes. Anterior slope 
long and gentle, forming a broad depressed area in the anterior third. Greatest 
width anterior to the middle. Surface marked by fine, elevated concentric lines 
crowded along the sides but often indistinct on the median region. 
Measurements in mm.—Length 5.9, width 4.3. 
Figured specimen.—109298. 
Horizon and locality—Dutchtown formation in Missouri: Geiser Quarry, 14 
miles east of Dutchtown, Cape Girardeau (15’) Quadrangle. 
LINGULELLA ? sp. 8 
Plate o, B, figures 7, 8 
Shell small, narrowly oval in outline and with the narrowest part at the pos- 
terior ; anterior narrowly rounded ; surface marked by distant, elevated corruga- 
tions. Interior with a median callosity. 
Figured specimen.—116779. 
Horizon and locality —Pratt Ferry formation in Alabama: 0.2 mile southeast 
of Pratt Ferry, Blocton (15’) Quadrangle. 
