PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 199 
Horizon and locality.—Botetourt formation (Cybeloides bed) in Virginia: 
4 mile east of Strasburg Junction, Strasburg (15’) Quadrangle. 
Discussion.—This small species is characterized by its lustrous black color, 
strong convexity, and narrowly oval form. It suggests Elliptoglossa in outline 
but is much more convex. It is not close to any other described Ordovician species 
of Lingulella. 
LINGULELLA FOSTERMONTENSIS (Butts) 
Plate 1, E, figures 13-18; plate 10, D, figures 18-22 
Lingula fostermontensis Butts, Alabama Geol. Surv., Special Rep. 14, p. 108, pl. 22, figs. 11, 
12, 1926. 
Shell of medium size for the genus, subpentagonal to elongate oval in outline ; | 
longer than wide with the greatest width at about the middle. Valves nearly 
equal in depth; lateral margins subparallel; anterolateral extremities strongly 
rounded; anterior margin only moderately rounded. Posterolateral and lateral 
margins forming a distinct shoulder, particularly in young specimens. Color 
dark brown. Surface marked by irregularly spaced concentric undulations crossed 
by fine concentric wavy lines. 
Pedicle valve with beak missing in all specimens; gently convex in lateral 
profile but moderately convex in anterior profile. Full in midregion for two- 
thirds the length and with moderately steep slopes at the posterior becoming gen- 
tler anteriorly. Front third flattened. 
Brachial valve having posterolateral shoulders prominent, flattened ; umbonal 
region swollen but merging into the flattened front third. Lateral slopes steep 
and abrupt to the flattened areas defining the shoulders. Beak protruding slightly 
posterior to the posterior margin. Anterior slope gentle. 
Measurements in mm.— 
Length Width Thickness 
Lectotype (bractial *valve) <..0......-...-5 ba 8.9 1.5 
Paratype (pedicle valve 71490a) ........... 13.0+ 8.9 1.5 
Hypotype( “ sa AT LO7Z5Oa IN Ae 20.8 12 Toy 
és (brachial valve 116759b) ......... 18.5 10.8 1.3 
Types.—Lectotype: 71490b; paratype: 71490a; figured hypotypes: 109284d, 
116759a-c ; unfigured hypotypes: 109284a-c,e-f, 116759d-f. 
Horizon and locality.—Attalla formation (Blackford facies), Alabama: West 
base of Foster Mountain, 14 miles northwest of Clay, Jefferson County, Leeds 
(15’) Quadrangle. 
Discussion.—This species is characterized by its solid form, fairly prominent 
posterolateral shoulders, strong concentric undulations covered by fine concentric 
but wavy lines. In shape it suggests Lingulella brainerdi Raymond and Pseudo- 
lingula luttrellensis Cooper, new species, but both of these have less distinct 
shoulders on the brachial valve. 
