216 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Types.—Holotype : 109303b ; figured paratypes : 109303d, 116762a,b ; unfigured 
paratypes : 109303a,c, 116762c. 
Horizon and locality—Bromide formation (Pooleville member-O-soplecia 
gouldi zone) in Oklahoma: Rock Crossing of Hickory Creek, about center sec. 
35, T.5 S., R. 1 E., Criner Hills, Carter County. 
Discussion—No perfect specimens of this species are known although many 
collections were taken from Rock Crossing, where it is frequent but not com- 
mon. The two brachial beaks preserved are rather imperfect but indicate a thick- 
ened inner band. The species is not like any other Pseudolingula herein 
described. 
PSEUDOLINGULA ? LUTTRELLENSIS Cooper, new species 
Plate 1, D, figures 6-12 
Shell substance thin, shell large but compressed; subpentagonal in outline. 
Width equal to about three-fourths the length. Apical angle of the pedicle valve 
104°. Posterolateral margins straight; posterolateral extremity somewhat nar- 
rowly rounded; lateral margins very gently curved; anterolateral extremities 
narrowly rounded and the anterior margin gently convex. Greatest width 
slightly anterior to the middle. Surface marked by fine, wavy concentric lines, 
stronger on the flanks than on the central portion, where they are very fine. 
Pedicle valve very gently convex in both profiles, shallow. Anterior third 
broadly sulcate; posterior two-thirds of valve slightly swollen and forming the 
deepest part. 
Brachial valve more convex than the pedicle one and with the median portion 
of the posterior two-thirds swollen gently and moderately convex. The lateral 
slopes to the margins are short and fairly steep but the posterior slope, occupy- 
ing the anterior third is long and gentle. Posterior margin narrowly rounded. 
Beak low, protruding slightly posterior to the posterior margin. 
Measurements in mm.— 
Length Width Thickness 
Paratype (pedicle valve 109286a) ............ 20.5 15.2 ? 
ik (brachial valve 109286c) .......... 19.3 15.0 1* 
Types.—Holotype: 109286b; figured paratypes: 109286a,c. 
Horizon and locality —Moccasin formation in Tennessee: Near Luttrell, Lut- 
trell (T.V.A. 155-NW) Quadrangle. 
Discussion.—The outline and compressed form of this species suggest affinity 
with Lingulella brainerdi and P. ? eva. It differs from the former in having a 
more beautiful and complex concentric ornamentation, a more obtusely angular 
beak, and less abruptly rounded anterolateral extremities. Pseudolingula ? eva 
has similar proportions to P. ? luttrellensis but is somewhat more acuminate 
apically and more broadly rounded anteriorly. 
