PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 633 
Measurements in mm.— 
Brachial 
Length length Width Thickness 
TERNS ial sa ibiciare! cyacte + ofeiS ae sialaueid 8.8 8.1 0.3 5.4 
Paratype: Glib SS0R) cc ese cals 8.2 7.4 8.7 6.6 
< BR SCC) 2) hea ee Re eR 0.4 8.5 85 5.9 
Types——Holotype: 111520b; figured paratypes: 111458a,b, 1115202, 
I11524a-c, 111793a-c, 118036; unfigured paratypes: 111520c,d. 
Horizon and locality——Lower Lenoir formation in Tennessee: East of U. S. 
Highway 11 about 4 mile south of the hosiery mill in Lenoir City, Lenoir City 
(T.V.A. 130-SE) Quadrangle; south bank Southern RR., 14 miles southwest of 
Philadelphia, Philadelphia (T.V.A. 130-NW) Quadrangle; 3 miles northeast of 
Athens, Athens (T.V.A. 125-NE) Quadrangle; just above the Knox in the cal- 
carenites behind the Friends Church, Friendsville, Concord (T.V.A. 138-SW) 
Quadrangle ; 50 feet above the Mosheim formation at Marble Bluff, 8 miles west- 
northwest of Loudon, Loudon (30’) Quadrangle. 
Mosheim formation in Tennessee: 3 mile east of the railroad station just east 
of Morristown, Morristown (T.V.A. 163-NE) Quadrangle. 
Tumbez formation (part) in Virginia: On Virginia Highway 80, 0.8 mile 
north of Geisler Mill, Glade Spring (T.V.A. 212-SE) Quadrangle; in Moccasin 
Creek along Virginia Highway 679, # mile south of Tumbez, Moll Creek (T.V.A. 
196-SE) Quadrangle; Staunton Lime Quarry, 4 to 3 mile north of Virginia 
Highway 250, 2 miles east of Staunton, Staunton (15’) Quadrangle. 
Mosheim formation in Alabama: 4 to 4 mile southwest of Newhope Church, 
Vandiver (15’) Quadrangle. 
Lenoir formation in Alabama: 2 to 3 miles south of Pelham, Bessemer Iron 
District (15’) Quadrangle. 
Row Park formation in Maryland: On the Duffy Farm, 0.6 miles west of 
Hicksville and 0.8 mile south-southwest of Fairview, Williamsport (15’) Quad- 
rangle. 
Discussion.—For some years this species has been referred to R. pristina Ray- 
mond, but it is a quite different species. Rostricellula basalaris occurs in many 
places at the base of the Lenoir limestone. It is a lover of calcarenites and some- 
what silty limestone. The species is characterized by a distinctly triangular out- 
line, a small apical angle, the midwidth anterior to the middle, and a variable 
number of costae in the sulcus. The New York Chazyan species is more rounded 
laterally and with the maximum midwidth at about the middle. Furthermore, 
its apical angle is greater than that of the Southern Appalachians species. 
Rostricellula basalaris shows considerable variability from place to place, some 
of it due to preservation. Specimens from the Mosheim limestone in Alabama 
are often somewhat distorted, as are specimens from Staunton, Va. The distor- 
tion may somewhat thicken the shells if the pressure has been directed parallel to 
the long axis. 
