858 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Horizon and locality —Bromide formation (Mountain Lake member) in Okla- 
homa: Slightly north of the middle of sec. 32, T. 2 S., R. 2 E., 2 to 3 miles 
northeast of Springer, Carter County. 
Discussion.—This species is characterized by the strength and variety of its 
wrinkling. The marginal regions are characterized by stronger wrinkling than 
in the umbonal and median regions. Some of the wrinkles are chevron shaped 
so that the ornamentation suggests that of Ptychoglyptus. No other species is 
marked like this one. Under B. concentrica a brief comparison is made to this 
species, but the Pierce form has much stronger and more regularly concentric 
wrinkles in the marginal zone. 
A fragmentary pedicle interior shows that this species attains a size greater 
than the figured types. This specimen has a length of 11 mm. and the width is 
indicated as 14 mm. The specimen shows no signs of geniculation at this length. 
BELLIMURINA SULCATA Cooper, new species 
Plate 223, A, figures 1-3 
Shell of about medium size for the genus, slightly longer than wide; hinge 
about equal to the width at the middle; sides gently rounded; anterior margin 
somewhat narrowly rounded. Surface marked by small irregular wrinkles on 
the visceral region and fine costellae that cover wrinkles and trail. 
Pedicle valve unevenly convex, the posterior half flattened and the anterior 
half convex; maximum depth located just anterior to the middle; anterior pro- 
file broadly and moderately domed. Visceral region separated from trail by a 
narrow, shallow groove. Trail anterior to groove long, convex, and with a steep 
anterior slope. 
Measurements in mm.—Holotype, length 11.5, midwidth 13.9, hinge width 
13.0, thickness 2.7. 
Type.—Holotype: 117654. 
Horizon and locality—Pratt Ferry formation in Alabama: 0.2 mile southeast 
of Pratt Ferry, Blocton (15’) Quadrangle. 
Discussion—This is a fairly convex form and unlike most members of the 
genus is marked by a long and prominent trail. The visceral region is sepa- 
rated from the trail by a shallow sulcus; the trail extends from the anterior rim 
of the sulcus. This species differs from all other Bellimurinas in the features 
named and in the long convex trail. The features described are suggestive of 
Limbimurina, but the curved sulcus anterior to the visceral disk is not so deep 
and the strong element of geniculation toward the pedicle valve is not developed. 
BELLIMURINA sp. 1 
Plate 222, D, figure 5 
This is a moderately convex species known only from the pedicle valve. It is 
characterized by irregular wrinkles and a slight anterior peripheral depression. 
Measurements in mm.—117657<a, length 11.0, width 12.6. 
Figured specimen.—117657a. 
