772 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
road in glade, 4 mile southeast of Friendsville, Concord (T.V.A. 138-SW) 
Quadrangle; 4 mile south of McMullens, Meadow (T.V.A. 139-NW) Quad- 
rangle; 1,500 feet south of the mouth of Burnett Creek, Shooks Gap (T.V.A. 
147-NE) Quadrangle; small quarry 4 mile northeast of St. Clair, Bulls Gap 
(T.V.A. 171-SE) Quadrangle; 1 mile northeast of Friendsville, Louisville 
(T.V.A. 138-SE) Quadrangle; 6 to 10 miles southeast of Loudon; 54 miles 
southeast of Knoxville. 
Tellico formation in Tennessee: On the south side of Chapman Highway 
(Tennessee Highway 71), 0.3 mile N. 10° W. of Pitner School, Walden Creek 
(T.V.A. 156-SW) Quadrangle. 
Arline formation in Virginia: In the quarry at the railroad station in Marion, 
Marion (T.V.A. 218-SE) Quadrangle. 
Botetourt formation in Virginia: On Virginia Highway 114, 2.3 miles west 
of the Montgomery-Roanoke County line, 12 miles northeast of Blacksburg. 
Effna formation in Virginia: In Porterfield Quarry, 5 miles east of Saltville, 
Maccrady (T.V.A. 218-NW) Quadrangle. 
Discussion—Bimuria superba is the largest of the known American species 
of Bimuria. It is characterized by its large size, attaining nearly an inch in 
width, and its generally subquadrate form. Its nearest relative is B. buttsi from 
which it differs in not having the wide hinge and oblique sides in the younger 
stages and by attaining a larger size than that reached by B. buttsi. The umbo 
of B. superba is not so elevated and narrowly convex as that of B. butts. 
BIMURIA sp. 1 
Plate 210, FE, figures 12-14 
A single fragmentary specimen of moderate size was found in the dark shaly 
rock under the Eureka quartzite on the north-facing nose of hill 8167, Martins 
Ridge, Monitor Range, Nev. The specimen is somewhat suggestive of B. lamel- 
losa Bassler, but it is not well enough preserved to be definitely so identified. 
Figured specimen.—117473. 
CRASPEDELIA Cooper, new genus 
(Greek kraspedon, border of a garment) 
Shell small, resembling small Bimuria; strongly concavo-convex; transverse 
and with the hinge equal to or greater than the widest part; surface smooth; 
pseudopunctate. 
Pedicle valve with swollen umbo and median region; foramen produced into 
a short siphon; interarea short, anacline; teeth short and wide; dental plates 
absent; other details of the interior not discernible. Anterior margin deflected 
toward the pedicle valve to form an elevated rim that fits inside a similar rim 
on the brachial valve. 
Brachial valve with anterior margin deflected in the direction of the pedicle 
valve to form a high rim which fits outside the edge of the pedicle valve; inter- 
area hypercline ; chilidial plates small. Brachial process small, widely divergent 
and adhering closely to the palintrope edge. Median septum rising to a crest a 
