620 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
brachiopod. The hooklike extension on the crura may be seen also in well- 
preserved specimens of Lepidocyclus, but there the similarity ends. The orna- 
mentation of the genus is unlike that of typical rhynchonellids, and the absence 
of a septum in the brachial valve is also atypical for rhynchonellids. 
ANCISTRORHYNCHA AUSTRALIS (Foerste) 
Plate 127, E, figures 28-32; plate 127, F, figures 33-41; plate 127, G, figures 42-46 
Protorhyncha dubia Hatt and CLARKE (part), Pal. New York, vol. 8, pt. 2, p. 180, 1894. 
Protorhyncha ridleyana RayMonp (part), Ann. Carnegie Mus., vol. 7, No. 2, p. 226, I191t. 
Catazyga uphami-australis Forrste, Bull. Sci. Lab., Denison Univ., vol. 16, p. 31, pl. 2, 
figs. 19a, b; pl. 3, figs. 14a-c, 1910. 
Shell small, subcircular in outline; beak forming an obtuse angle; sides some- 
what narrowly rounded ; front margin gently rounded. Surface marked by broad, 
rounded costae separated by spaces narrower than the costae, about 54 costae in 
all, with 11 in the sulcus. 
Pedicle valve moderately convex in lateral profile with the greatest convexity 
in the posterior half; umbonal region swollen; beak strongly curved over the 
brachial umbo ; sulcus short, shallow,’ originating slightly anterior to the middle, 
occupying less than half the width; tongue short, rounded. Flanks rounded, with 
fairly steep slopes to the margins. 
Brachial valve fairly evenly convex in lateral profile, broadly convex in an- 
terior profile. Umbonal and median regions swollen; fold a low, gentle swelling 
originating anterior to the middle, narrow. Flanks rounded, depressed below 
the fold; lateral slopes moderate. 
Measurements in mm.— 
Brachial 
Length length Width Thickness 
TL CEOW Dees uaiscye stersisepts etcemynw: stele as is 7.0 7.6 9.0 5.5 
Fivpotype, Cini Zora) ena wists he as 7.7 6.7 8.4 4-3 
. CTTTADIC) 24, he: PP 8.7 7.8 10.6 5.5 
Types.—Lectotype: 87043a; figured hypotypes: 111291a-c, Columbia Uni- 
versity (no number). 
Horizon and locality—Camp Nelson formation in Kentucky: At High Bridge, 
Harrodsburg (30’) Quadrangle. 
Lebanon formation in Tennessee: Opposite the Fairview Service Station on 
U. S. Highway 70N, just west of Rome and 11.6 miles east of Lebanon, Smith 
County. 
Nealmont formation in Pennsylvania: 1 mile west of Tusseyville, Centre Hall 
(15’) Quadrangle ; south of Pa. C. Ry., Bellefonte, Bellefonte (15’) Quadrangle. 
Discussion.—This species is characterized by its soft, rounded outlines, nar- 
row fold and sulcus, and the fine, crowded costae. It is most like A. costata but 
differs from that species in its narrower fold and sulcus and the finer ornamenta- 
tion. The fact that the finely costate forms outside of the High Bridge area are 
post-Ridley and Wardell, suggests that the level containing this species at High 
Bridge belongs to the Lebanon, Nealmont, and lower Trenton. 
