214 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Discussion—The genus Leptobolus has been widely identified, but no un- 
equivocal species of the genus has been found in the rocks treated in this mono- 
graph. A small brachiopod having the exterior form of Leptobolus occurs in 
the Liberty Hall facies of Virginia, but it fails to show the characteristic septa 
in either valve. The best-preserved and unquestionable members of the genus 
occur in Trenton-Cincinnatian rocks, but Reudemann described an unusually 
large species, L. walcotti, from the Normanskill shale. According to his illus- 
trations the brachial valve has a median septum. This, then, would probably 
be the oldest member of the genus unless this part of the Normanskill should 
prove to be of the same age as Trenton sedimentation. 
Elliptoglossa has been confused with Leptobolus, but even casual examination 
of the interiors should obviate confusion. Actually the exterior form and orna- 
mentation of the two genera are quite different, but examination of the interior 
details will settle the generic identity. Elliptoglossa is one of the peculiar brachio- 
pods not provided with a pedicle groove, and no species has yet been found that 
has septa like those of Lepiobolus. 
LEPTOBOLUS WALCOTTI Ruedemann 
Leptobolus walcotti RUEDEMANN, New York State Mus. Bull. 42, p. 560, pl. 1, figs. 6-12, 1901. 
Horizon and locality—Normanskill shale in New York: At Kenwood and 
Glenmont near Albany; Mount Merino near Hudson. 
LEPTOBOLUS ? sp. 1 
Plate 12, C, figures 7, 8 
Shells minute, oval in outline with the greatest width anterior to the middle. 
Pedicle valve nearly flat to very gently convex in lateral profile, gently convex 
in anterior profile. Brachial valve unevenly convex with the greatest convexity 
in the unbonal region. Anterior profile moderately convex. Umbonal and median 
regions swollen ; anterior and lateral slopes gentle. Surface of both valves marked 
by distant growth lamellae and fine concentric lines. Details of the interior 
obscure. 
Figured specimens.—109344a,b. 
Horizon and locality—Edinburg formation (Liberty Hall facies) in Virginia: 
Middle River north-northeast of Staunton, Staunton (15’) Quadrangle. 
LEPTOBOLUS ? sp. 2 
Two specimens from the upper 40 feet of the Edinburg limestone in the sec- 
tion 4 mile west of Strasburg are larger than the above, and the exterior is orna- 
mented by distinct and numerous radial wrinkles as well as fine concentric lines. 
No details of the interior can be distinguished. 
Described specimens—1093438a,b. 
