604 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
bounded by short, narrow, and oblique costae. Flanks gently convex and sloping 
steeply to the sides. Dental plates long, extending for about one-quarter the 
length. 
Brachial valve moderately convex in lateral profile, strongly and somewhat 
narrowly convex in anterior profile ; beak narrow and long, curved over the inter- 
area of the pedicle valve. Umbo narrow and swollen; posteromedian region 
swollen; fold originating just posterior to the middle, narrow, steep sides and 
with flattened surface; midline of fold marked by a slight depression; fold 
bounded by narrow and fairly deep sulci; flanks narrowly rounded and with 
steep slopes. 
Measurements in mm.— 
Brachial Hinge 
Length length Midwidth width Thickness 
Holatypers. faesastcamdaaes oo 14.4 13.7 14.7 4.5 11.3 
Paratmpe (123280). i: aimesen 11.8 11.5 11.0 3.8 6.8 
Types.—Holotype: 111321; figured paratypes: 111322a, 123289; unfigured 
paratypes: 111318a-h, 111322b,c. 
Horizon and locality.—Ellett formation (55 feet above the base) in Virginia: 
On Indian Run, 3 mile northwest of Lusters Gate, Blacksburg (15’) Quadrangle. 
Mosheim limestone in Tennessee: 4 mile east of the railroad station just east of 
Morristown, Morristown (T.V.A. 163-NE) Quadrangle; along the Southern 
RR. 3 mile south of Mosheim, Mosheim (T.V.A. 181-NW) Quadrangle; Climer 
Post Office, 7 miles east of Cleveland, Benton (T.V.A. 126-NW) Quadrangle. 
Same limestone in Alabama: 4 mile southwest of Newhope Church, Vandiver 
(15’) Quadrangle; $ mile east of Odenville, Springville (30’) Quadrangle. 
Discussion—This species is characterized by its oval or pentameral outline, 
the elevated and abrupt median fold, and moderately deep sulcus. It is larger 
than S. bicostata and completely unlike that species. 
Family PARASTROPHINIDAE Ulrich and Cooper, 1936 
Syntrophoidea having a spondylium duplex and a cruralium duplex of sub- 
parallel brachiophore plates with alate processes. 
Subfamily PARASTROPHININAE Schuchert, 1929 
Parastrophinidae having a cruralium duplex. 
Genus PARASTROPHINA Schuchert and LeVene, 1929 
Parastrophia HAut and CLARKE, Pal. New York, vol. 8, pt. 2, p. 221, 1893. 
Parastrophina ScHUCHERT and LEVENE, Amer. Journ. Sci., vol. 17, p. 121, 1929.—StT. JosEPH, 
Geol. Mag., vol. 78, No. 5, p. 371, 1941. 
PARASTROPHINA BERNENSIS (Sardeson) 
Camarella bernensis Sarpeson, Minnesota Acad. Nat. Sci., Bull. 3, p. 328, pl. 4, figs. 4-6, 
1892. 
