PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 955 
way 58, 3 to 34 miles east of Cumberland Gap, Wheeler (T.V.A. 153-SE) 
Quadrangle ; Pennington Gap, Lee County. 
Same formation in Tennessee: Lat. 36°17'31”, long. 83°53'55”, 4 mile north 
of Sill (locality now under waters of Norris Lake), White Hollow (T.V.A. 
145-SW) Quadrangle. 
Discussion.—This species is characterized by its large size, nearly flat brachial 
valve, and fairly fine costellae. The species has been widely identified on the 
west side of the Appalachians, in Kentucky and West Tennessee. The species 
is fairly characteristic in Curdsville rocks, but references to it in the Hermitage 
formation are probably erroneous. 
The authorship and type specimen of this species need explanation and de- 
scription. In his reference to the species on page 82, Bassler (1909) gives Ulrich 
as the author. In the plate legend no author’s name is used. Inasmuch as there 
is no description of the species by Bassler and none has ever been given since 
1909, it seems apparent that Bassler was citing a species Ulrich had studied and 
intended to describe. 
In the plate legend (pl. 24) no enlargement is given for the specimen illus- 
trated. Comparison of the specimen and picture indicate an enlargement of 
x14. The specimens, except for one, are thus all small individuals. The ex- 
ception mentioned is the pedicle interior of a large specimen, and a brachial in- 
terior of nearly the same size appears on the same piece. This is not shown in 
the illustration but must be numbered among the cotypes. Comparison of the 
illustrated slab with a good suite of shells of all sizes from the Curdsville forma- 
tion, 54 miles northeast of Maynardville, Tenn., on Tennessee Highway 33 
shows that the small individuals so abundant on the type slab are actually the 
young of a larger form. The larger forms from Maynardville are identical with 
the large interiors on the type slab. The writer therefore selects as type of the 
species the brachial interior mentioned above and here designated 96362b. This 
specimen shows the generic characters well. 
Several localities and stratigraphic levels produce Onniellas strongly sugges- 
tive of O. fertilis. Most of these are undescribed species outside the scope of 
this monograph. Onniella fertilis differs from O. planoconvexa from the Hermi- 
tage of West Tennessee in its greater size and more transverse form. 
ONNIELLA PAQUETTENSIS Sinclair 
Onniella paquettensis SINCLAIR, Canadian Field-Nat., vol. 59, No. 3, p. 73, pl. 2, figs. 2, 3, 
1945. 
Horizon and locality—Rockland formation in Ontario, Canada: Paquette 
Rapids on the Ottawa River. 
ONNIELLA ? PLANOCONVEXA Cooper, new species 
Plate 161, C, figures 23-36 
Shell of about medium size for the genus, roundly elliptical in outline, with 
strongly rounded sides and anterior margins. Anterior commissure faintly sul- 
