228 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
GLOSSELLA Cooper, new genus 
(Greek glossa, tongue) 
Shell fairly large, thin, longer than wide and with sides gently curved but sub- 
parallel ; surface marked by concentric and radial rows of small pustules. In the 
posterior and median portion of the valves pustules densely crowded and matted 
to give a shagreen surface. At the anterior and on the lateral areas the pustules 
are arranged in more distant lines. Pedicle interior with narrow propareas be- 
tween which is suspended a shallow concave plate. Muscle marks not clearly 
visible in material at hand. Brachial valve with concave propareas and an in- 
flected margin at the beak which is formed by the posterolateral margin of the 
shell gradually turning through an angle of about 90°. Muscle scars not discerni- 
ble in the material at hand. 
Genotype.—Glossella papillosa Cooper, new species. 
Discussion.—This genus is based on the linguloid form of the shell combined 
with its hinge-region structures and the peculiar ornamentation. The ornamenta- 
tion is suggestive of Lingulasma, but the interior platforms are not present in 
Glossella. Furthermore, the ornamentation is not precisely like that of Lingu- 
lasma. The latter genus generally has more distant radial lines, and the pustules 
are often defined by gashes or pits. 
GLOSSELLA LIUMBONA Cooper 
Plate 4, A, figures 1-4; plate 9,I, figures 23-25; plate 13, E, figures 7-12 
Shell fairly large, elongate, length about twice the width, narrowly elliptical 
in outline, with gently rounded lateral margins ; posterior margin bluntly pointed ; 
anterior margin narrowly rounded. Unequally biconvex in lateral profile, the 
pedicle valve having the lesser convexity ; surface marked by concentric undula- 
tions which are crossed by radial and concentric rows of pustules. Umbonal re- 
gion of both valves marked by concentric undulations only. Surface in postero- 
median portion of valve having a shagreen surface where ornamentation is very 
fine. 
Pedicle valve gently convex in lateral profile, with the deepest part located 
near the middle ; umbonal region smooth for about 1 mm. Brachial valve broadly 
convex in lateral profile, with the greatest convexity located at about the mid- 
dle; anterior profile considerably more convex than that of the pedicle valve, 
swollen medianly and with fairly long and steep lateral slopes. 
Measurements in mm.— 
Length Width Thickness 
PAO PE Sean eid ke w> Lhinttens Moments ROG RONEN s 20.9-+ 12.3 5.7 
Paratene (1t6786). civic scchude de alec sok 11.2 actual ? ? 
4 TOR 2IBB Yas ive nleeeirolaie dhe a testa oe ial 9.5 4.6 P 
. CUEGZS5 Dy) toucdescutt cusses aoe Per ee 16.3 10.1 3.4 
Types.—Holotype: 116785a; figured paratypes: 109285, 116785b, 116786. 
Horizon and locality—Bromide formation (Pooleville member-O-xoplecia 
gouldi zone) in Oklahoma: Rock Crossing of Hickory Creek about center sec. 
