226 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
convex, the brachial valve having the greater convexity. Lateral margins broadly 
rounded ; posterior margin bluntly pointed, forming an angle of about 80°. Sur- 
face marked by strong concentric undulations. 
Pedicle valve unevenly convex in lateral profile with the greatest convexity 
located about a third the length anterior to the beak. Anterior profile fairly 
strongly convex with flat and moderately steep lateral slopes. Anterior slope 
long and gentle. Umbonal region swollen. Pedicle valve with broad, shallow 
pedicle groove; brachial valve with evidence of a long, low median ridge. 
Brachial valve deeper than the pedicle one and with the greatest convexity 
just posterior to the middle; anterior profile strongly convex with steep lateral 
slopes. Anterior slope moderately steep. Outline broadly elliptical with anterior 
and posterior margins subequally rounded. 
Measurements in mm.— 
Length Width Thickness 
PIGIGEY DE - oiveievs a sa kee dee aoe ee 26.0+ 16.4 7.3+ 
Paratype '(1OO337) “..:- se. ce tee eens ete 19.3 15.5 3.0 
Types.—Holotype: 116767; figured paratypes: 109337, 116766, 116768. 
Horizon and locality—Botetourt formation in Virginia: At the junction of 
Virginia Highways 311 and 114, 4 mile southwest of Catawba, Salem (15) 
Quadrangle; Effna formation in Virginia: At Porterfield Quarry, 5 miles east 
of Saltville; McNutt Quarry, 12 miles southwest of Bland, Burkes Garden (15') 
Quadrangle; Chatham Hill formation in Virginia: At Grayson Farm, 4 miles 
southwest of Bland, Bland County. 
Benbolt formation in Virginia: At the Tazewell County Farm, 1 mile east of 
Tazewell, Burkes Garden (15’) Quadrangle. 
Pratt Ferry limestone in Alabama: 0.2 mile southeast of Pratt Ferry, Blocton 
(15’) Quadrangle. 
Discussion.—This species can be readily recognized by its large size and gen- 
erally thick shell. It is suggestive of P. biconvexa but is much larger, differently 
colored, and thicker shelled. Specimens referred to this species from Pratt Ferry, 
Porterfield Quarry, and the Benbolt at the Tazewell County Farm seem to be 
younger specimens with thinner shells. Possibly the thinner shell in the latter 
instances constitutes an environmental difference. 
GLYPTOGLOSSA Cooper, new genus 
(Greek glyptos, engraved; glossa, tongue) 
Elongate oval linguloids with moderately convex valves ornamented by con- 
centric lamellae scalloped along their margins. Brachial interior with median 
septum reaching to about the valve middle. 
Genotype.—Glyptoglossa cavellosa Cooper, new species. 
Discussion.—Little is known of the interior of this genus except that the 
brachial valve is provided with a median septum. The generic separation is made 
on the basis of the unusual ornamentation. 
In the Girvan fauna of Scotland Lingulasma ? ardmillanense Reed has the 
