196 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
an apical angle of 70° to 80°; posterolateral margins straight; lateral margins 
moderately strongly curved and gradually passing into the broadly curved an- 
terior margin. Surface of both valves marked by elevated concentric lines crowded 
on the lateral margins but more distant where they swing over the median parts 
of the valves. 
Pedicle valve with lateral profile gently convex and with maximum depth 
slightly posterior to the middle; anterior slope long and gentle; anterior profile 
fairly strongly convex. 
Brachial valve less acuminate at the beak than the pedicle valve and with 
gently rounded lateral margins; lateral profile flat medianly but with nearly equal 
and gentle anterior and posterior slopes occupying the anterior and posterior 
quarters. Umbonal and median regions somewhat swollen. Anterior profile 
broadly curved. 
Interior of pedicle valve with blisterlike, elongate triangular folds inside the 
beak, the folds bounding a deep pedicle groove. Brachial valve with thickened 
posterior margin and deep umbonal cavity and a long, low median ridge extend- 
ing to about the middle. 
Measurements in mm.— 
Length Width Thickness 
Holotype. (brachial valve). ocerenus - A-.simo asco 8.9 6.6 ? 
Paratype (pedicle valve 1093092) ........... 10.7 7.6 1.0 ? 
C Op. +, SEOOZOOR ) ls Hels teres 11.2 8.4 ? 
Types.—Holotype: 1093094 ; figured paratype: 109309b; unfigured paratypes: 
1093094,c. 
Horizon and locality—Pratt Ferry formation in Alabama: 0.2 mile southeast 
of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion.—Lingulella alabamensis is characterized by having a widely oval 
outline and somewhat attenuated beaks. It differs from L. lirata, which it resem- 
bles, in its wider anterior region and more narrowly pointed beaks. 
LINGULELLA BRAINERDI (Raymond) 
Plate 3, D, figures 8-12 
Lingula brainerdi Raymonp, Bull. Amer. Paleont., vol. 3, p. 36, pl. 18, figs. 2, 3, 1902; Ann. 
Carnegie Mus., vol. 7, No. 2, p. 217, pl. 33, fig. 2, 1911. 
Lingula limitaris SrELY (nom. nud.), Rep. State Geol. Vermont, n. s., vol. 1, p. 145, 1902; 
vol. 5, p. 183, pl. 41, 1906. 
Shell of moderate size for the genus, longer than wide; outline subpentagonal ; 
apical angle about go°; lateral margins gently curved to nearly straight and 
forming shoulders with the posterolateral margins. Anterolateral extremities 
narrowly rounded to subangular; anterior margin gently rounded. Greatest 
width located between the anterolateral angles and the posterolateral shoulders. 
Ornamentation consisting of fine concentric growth lines and stronger, more 
distant concentric undulations. 
Pedicle valve gently convex in lateral profile with the greatest convexity about 
one-third the length anterior to the beak. Valve full in the midregion but slop- 
