690 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Brachial valve moderately convex in lateral profile with the maximum con- 
vexity at about the middle; anterior profile broadly convex, less convex than the 
pedicle valve. Umbo narrowed slightly at the beak, otherwise broadly swollen; 
median region and flanks swollen. 
Measurements in mm.— 
Length Width Thickness 
EROLO EY PEs 5 Ries Reel shee Cha Dee eee Beee ake 4.5 3.8 ? 
Paratype (CU, 26401,( 1056) 4) .+, 4 serine 21 2.8 By 
Types.—Holotype: Columbia Univ. 26401(1056) ; unfigured paratype: Co- 
lumbia Univ. 26401(1056)a; unfigured and unnumbered paratypes on slab with 
holotype. 
Horizon and locality—Benner-Stover formation in Pennsylvania: In a small 
quarry west of the road 1 mile south of Jacksonville, Centre Hall (15’) Quad- 
rangle. 
Discussion.—This species is distinguished from H. saffordi and H. globularis 
by its very fine costellae as compared to those of the other two. 
HALLINA SAFFORDI Winchell and Schuchert 
Plate 142, F, figures 26-28; plate 143, J, figure 47 
Hallina saffordi WINCHELL and ScHucHERT, Amer. Geol., vol. 9, p. 292, 1892; Geol. Minne- 
sota, vol. 3, p. 473, pl. 34, figs. 55-58, 1895.—H ALL and CriarkE, Pal. New York, vol. 8, 
pt. 2, p. 151, figs. 139, 141, 1804. 
Zygospira saffordi (Winchell and Schuchert) BEECHER and ScHUCHERT, Proc. Biol. Soc. 
Washington, vol. 8, p. 71, pl. 10, fig. 22; pl. 11, figs. 13, 13a, 1803. 
Types.—Hypotypes : 123356a ; 117258a. 
Horizon and locality—About the middle of the Lebanon formation in Ten- 
nessee: At Lebanon and on the west side of U. S. Highway 41, 9} miles south- 
east of Murfreesboro, Rutherford County; Columbia, Maury County; and 24 
miles east of Priest, Franklin (15’) Quadrangle. 
Subfamily GiassimnaE Schuchert, 1929 
Small, smooth brachiopods with spirals compressed and directed toward the 
median part of the brachial valve and with the jugum continuous. 
IDIOSPIRA Cooper, new genus 
(Greek idio, own; spira, spire) 
Shells generally small, approaching or slightly exceeding 15 mm. in length; 
subcircular to subelliptical in outline; valves subequal in depth; anterior com- 
missure uniplicate; surface smooth, except for obscure short marginal costae at 
the anterior margins generally confined to the fold and sulcus. 
Pedicle valve with small incurved beak, elongate, like that of Protozyga, open 
foramen, and small teeth. Dental plates strongly developed. Brachial interior 
with divided hinge plate; sockets deep and long; outer socket ridge well de- 
veloped ; hinge plates small, triangular, concave. Median ridge indistinct. Spire 
