872 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
edge of the Howard Quarter (T.V.A. 162-NW) Quadrangle; 4 mile northeast of 
Halls School, behind the marble cliff, Howard Quarter (T.V.A. 162-NW) Quad- 
rangle; Lone Mountain to Tazewell road, 14 miles northeast of Lone Mountain, 
Tazewell (T.V.A. 154-NE) Quadrangle; 1 mile west of Lone Mountain, same 
quadrangle; 200 feet above the ‘““Mosheim” at the east foot of the third ridge, 
Loyston Pike toward Maynardville; Raccoon Valley just east of Edgemoor, 3.1 
miles southwest of Claxton, Clinton (T.V.A. 137-SW) Quadrangle ; 4 mile west 
of Dodson Creek on the road from Acuff to Tennessee Highway 33, Powder 
Springs (T.V.A. 154-SW) Quadrangle; west side, 1 mile from crest of Mis- 
sionary Ridge, Chattanooga, Chattanooga (30’) Quadrangle. 
Same formation in Virginia: At Rye Cove and vicinity, Clinchport (T.V.A. 
188-NW) Quadrangle; Virginia Highway 71 between Mason’s store and Dick- 
ensonville, Hansonville (T.V.A. 205-SW) Quadrangle; 0.2 mile southwest of 
New Bethel Church, 4 mile east of the junction of Virginia Highway 74 and 
U. S. Highway 54, Hilton (T.V.A. 197-NW) Quadrangle; Fugates Hill 2 miles 
N. 54° W. of Mendota, Bristol (30’) Quadrangle; 1 mile southeast of Hanson- 
ville, Brumley (T.V.A. 205-SE) Quadrangle; 4 miles east-northeast of Gate 
City, Gate City (T.V.A. 188-NE) Quadrangle; 4 mile southeast of Green Val- 
ley Church, Brumley (T.V.A. 205-SE) Quadrangle; south side of Mount Hagan 
School, Hilton (T.V.A. 197-NW) Quadrangle ; 0.2 mile south of the middle fork 
of Moccasin Creek, 13 miles due south of Hansonville, Hansonville (T.V.A. 
205-SW) ; 4 mile northeast of Speers Ferry, Clinchport (T.V.A. 188-NW) 
Quadrangle; north of Copper Creek bridge, 14 miles southeast of Nicklesville, 
Bristol (30’) Quadrangle; north side of Virginia Highway 74, 4 mile west of 
Mount Hagan School, Hilton (T.V.A. 197-NW) Quadrangle; 3 mile east- 
northeast of Cedar Point School, Hilton (T.V.A. 197-NW) Quadrangle. 
Discussion.—This species is often abundant in the Benbolt and is an excellent 
guide to that formation. The species is variable, but generally it is nearly square 
to subrectangular and is fairly strongly geniculated. It is the most strongly 
geniculated known member of this genus. The abrupt swelling of the anterior 
about two-thirds the length from the beak is a well-marked characteristic. The 
species varies considerably in size, and the larger the individual becomes, the 
more it increases its width. 
The only known species close to FR. tennesseensis are R. filicostellata and 
R. subparallela. From the former R. tennesseesis may be distinguished by its 
stronger geniculation and deeper brachial umbonal region. From the latter it 
differs in stronger geniculation, less deeply concave brachial umbo, and genicula- 
tion taking place nearer the brachial umbo. 
RHIPIDOMENA TENUITESTA (Willard) 
Plate 251, B, figures 13-17; plate 251, C, figure 18 
Strophomena tenuitesta WILLARD, Bull. Mus. Comp. Zool., Harvard Coll., vol. 68, No. 6, p. 287, 
pl. 2, figs. 15, 16, 1928. 
Shell large, width slightly greater than the length; greatest width anterior to 
the hinge; sides gently rounded; anterior margin strongly rounded; surface 
marked by alternating costellae, 2 to 4 to the millimeter at the front margin. 
