758 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
(30') Quadrangle; 2 miles south of Philadelphia, Philadelphia (T.V.A. 
131-NW) Quadrangle; quarry 4 mile northeast of St. Clair, Bulls Gap (T.V.A. 
171-SE) Quadrangle; 100 yards southwest of the Negro Cemetery, 4 mile north- 
east of Friendsville, Concord (T.V.A. 138-SW) Quadrangle; 10 feet below 
Holston= Red Knobs formation, 1 mile east-northeast of Friendsville, Louisville 
(T.V.A. 138-SE) Quadrangle. 
Arline formation in Virginia: Quarry at Marion, Marion (T.V.A. 218-SE) 
Quadrangle. 
Fetzer tongue in Tennessee: On the south side of the road 200 yards south- 
west of Blockhouse, Blockhouse (T.V.A. 148-NW) Quadrangle. 
Tellico formation in Tennessee: On the Chapman Highway (Tennessee 
Highway 71) 1.3 miles east-northeast of Cusick, Walden Creek (T.V.A. 
156-SW) Quadrangle. 
Little Oak formation in Alabama: Lock 3, cut on Seaboard Airline RR. 6 
miles east-northeast of Ragland, St. Clair County. 
Botetourt formation in Virginia: On Virginia Highway 114, 2.3 miles west 
of the Montgomery-Roanoke County line, 12 miles northeast of Blacksburg. 
Discussion.—This species as here described is a somewhat variable form con- 
sisting of individuals having the length and width nearly equal while others are 
definitely somewhat transverse. The exterior is characterized by strong con- 
vexity and a strongly geniculated trail marked by somewhat crowded strong 
costellae between which occur finer ones. The anterior is often somewhat nasute 
when viewed from the side showing the brachial valve. Young forms are trans- 
verse. Inside the pedicle valve the muscle area is small for such a large shell and 
contrasts strongly with L. abbreviata which is smaller but with a huge muscle 
area. 
Leptellina tennesseensis is a large species and is thus comparable to L. pulchra; 
it differs from that species in its less transverse outline and in the possession of 
crowded larger costellae on the geniculated trail. 
LEPTELLINA TRANSVERSA Cooper, new species 
Plate 191, A, figures 1-8 
Shell of about usual size for the genus, unusually transversely subelliptical 
in outline. Hinge forming widest part. Lateral and anterior margins forming 
a single broad curve. Surface costellate, 3 to 5 of the larger costellae in a space 
of 2 mm. at the anterior margin. 
Pedicle valve strongly convex in lateral profile with the maximum curvature 
near the middle. Anterior profile a broad arch slightly elevated medially. Umbo 
narrowly convex; beak small, protruding very slightly posterior to the posterior 
margin which is nearly straight. Umbonal ridge continued anteriorly as a low 
and narrow fold for about three-fourths the valve length but less distinctly in 
the anterior quarter. Flanks broad, slightly concave or nearly flat and with long, 
gentle slopes. Anterior slopes very steep. Interarea moderately long, apsacline. 
Brachial valve deeply concave in lateral profile, the concavity closely follow- 
