210 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
like that of Lingulella. The largest specimen is incomplete but measures 6.5 mm. 
in length and 5.2 mm. at its widest part. 
Type.—Holotype: 116780b; unfigured paratypes: 116780a,¢c,d. 
Horizon and locality Pratt Ferry formation in Alabama: 0.2 mile southeast 
of Pratt Ferry, Blocton (15’) Quadrangle. 
WESTONIA sp. 1 
Plate 1, B, figure 3 
Specimen incomplete, consisting of the posterior two-thirds of a brachial valve 
with swollen median and umbonal regions and gently curved lateral margins. 
Posterior profile somewhat narrowly convex and with fairly steep lateral slopes. 
Surface, particularly the median region, marked by transverse regular undula- 
tions forming a moderately deep V or chevron directed posteriorly in the median 
region. The chevrons are cancellated by strong concentric undulations which 
give the valve a pitted appearance in places. 
Figured specimen.—116781a. 
Horizon and locality—Lower part of Whitesburg formation in Tennessee: 
Just above the Fetzer formation, on the slope 24 miles southeast of Whitesburg, 
Bulls Gap (T.V.A. 171-SE) Quadrangle. 
Discussion——Another specimen in the collection, 109355, is a crushed valve 
having ornamentation similar to the above. The specimen was taken from the 
lower Athens formation from the prolific Christiania beds, 25 miles southeast of 
Riceville, Calhoun (T.V.A. 125-SW) Quadrangle, Tenn. 
SPINILINGULA Cooper, new species 
(Latin spina, a point) 
Shells small to medium-sized, suboval in outline, biconvex, surface concentri- 
cally lamellose, lamellae broad with short prone spines on their anterior margin. 
Pedicle valve interior with deep pedicle groove bounded by two Dlisterlike, 
elongate plates forming long umbonal cavities. Plates marked by narrow grooves 
where they are attached to the side of the valve. 
Brachial valve marked by a moderately long, undivided plate lying prone on 
the posterior surface, anteriorly emarginate. Brachial valve also marked by a 
faint median ridge, in adults extending from a point slightly posterior to the 
middle to the anterior margin. 
Genotype.—S pinilingula intralamellata Cooper, new species. 
Discussion.—This genus is characterized by an interior like that of Lingulella 
but with the exterior lamellose and spinose. It differs from other Lingulellinae 
in its exterior features. 
SPINILINGULA INTRALAMELLATA Cooper, new species 
Plate 2, A, figures 1-5; plate 11, J, figures 25-32 
Shell small, longer than wide, suboval in outline, with the greatest shell width 
at about the middle. Apex acute forming an angle of about 70°. Lateral mar- 
