PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 241 
a median swelling. Pedicle posterior slope more gentle than the brachial one. 
Beaks directed posteriorly, umbones small, narrowly rounded, and slightly ele- 
vated. Both valves marked by fine concentric lines and a few distant concentric 
growth lamellae. 
Measurements in mm.—Holotype, length 2.2, width 2.0, thickness 0.7. 
Types.—Holotype: 109752a; unfigured paratypes: 109752b-l. 
Horizon and locality—Bromide formation (Pooleville member-O-xoplecia 
gouldi zone), in Oklahoma: At Rock Crossing of Hickory Creek, about center 
sec. 35, [.5 S., R. 1 E.; ona branch of Hickory Creek in NW4 sec. 26, T. 5 S., 
R. 1 E., Criner Hills, Carter County. Two specimens are placed here that come 
from the Bromide formation (Mountain Lake member) at the Rock Crossing of 
Hickory Creek, and midway between Davis and Dougherty, NW34 sec. 27, T. 1 
S., R. 1 E., Murray County. 
Discussion.—This species by its small size suggests C. minor (Winchell and 
Schuchert) but differs in its still smaller size, less oval outline, and much fewer 
growth plaits. It is a far smaller shell than C. trentonensis Hall and will not be 
confused with it. 
CRANIOPS TRENTONENSIS (Hall) 
Plate 22, B, figure 2 
Pholidops trentonensis Hatt, Descr. new species Crinoidea and other fossils, p. 14, 1866; 
24th Ann. Rep. New York State Cab. Nat. Hist., p. 221, pl. 7, fig. 8, 1872.—BAssLER, 
U.S. Nat. Mus. Bull. 92, p. 960, 1915. 
Nealmont formation in Pennsylvania: Reedsville, Lewistown (15’) Quad- 
rangle. The collection from which the specimens were taken includes such genera 
as Pionodema which indicates clearly that these “Stones River” beds must be- 
long to the Nealmont formation and therefore must be of Trenton age. The 
nearly circular form of the shell, its large size, and the distant plaits are features 
that it shares with C. trentonensis. It is of about the same size as C. attenuata, 
but that species is narrowed anteriorly. 
Figured specimen.—10g9788b. 
ELLIPTOGLOSSA Cooper, new genus 
(Greek ellipto, elliptical; glossa, tongue) 
Shell small, longitudinally elliptical in outline with anterior and posterior mar- 
gins subequal, depth of valves subequal; surface marked by fine concentric lines 
and concentric undulations. Radial markings present in some species. 
Pedicle interior: Outer margin smooth and flattened along the line of valve 
junction; posterior margin broadly flattened and marked medially by a narrow 
depression, probably a pedicle groove. Pedicle attached to a small roughened 
area at the extreme posterior. Musculature suggesting Lingula but not identical 
with it. The umbonal muscle (or muscles) the most strongly impressed, but 
the external, central, and middle muscle scars discernible. The large laterals of 
Lingula apparently are absent. The visceral region forms a crudely trapezoidal 
area with the lateral angles formed by oblique, hooklike impressions. A low 
ridge extends from the umbonal muscle to a point anterior to the center. 
