1004. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
carina extending to the front margin as a narrow fold. Lateral slopes flat but 
long and gentle. Brachial valve gently convex in lateral profile; very gently 
convex in anterior profile. Sulcus originating at the umbo and widening rapidly 
to the anterior margin where it occupies fully half the width at the front 
margin. Flanks gently convex, with steepest slopes into the sulcus and long, 
gentle slopes to the margins. 
Measurements in mm.—Holotype, length 9.7, brachial length 9.0, width 11.1, 
hinge width 7.6, thickness 3.6. 
Types.—Holotype: 117320a; unfigured paratypes: 117320b-e. 
Horizon and locality—Upper Carters formation in Tennessee: Near Frank- 
lin, Franklin (15’) Quadrangle. 
Discussion.—This species differs from F. dalmanelloidea and F. subcarinata 
which are strongly carinate at the pedicle umbo in having a still stronger carina 
and one that is continued in strength to the anterior margin. It also has a 
stronger and deeper sulcus in the brachial valve than either of species mentioned 
above. Fascifera dalmanelloidea also has a shorter interarea, a more incurved 
beak, and a much narrower profile than the other species. The Carters species 
is more strongly costellate and fasciculate than the others. It should be noted 
that the generic assignment is based on subparallel plates visible at the umbo of 
the brachial valve when the shell is moistened. | 
FASCIFERA sp. 1 
Plate 143, G, figures 30-36 
Shell small for the genus, wider than long, somewhat rectangular in outline; 
sides and anterior margin rounded ; anterior commissure broadly sulcate. Sur- 
face costellate, costellae uneven in size, about 4 to the millimeter at the anterior 
margin. 
Pedicle valve deeper than the brachial valve, moderately convex in lateral pro- 
file and with the greatest convexity just anterior to the umbo; anterior profile 
somewhat narrowly convex in the median region and with long lateral slopes. 
Umbonal region convex, the narrowed convexity not extending noticeably an- 
terior to the middle. Interarea moderately long, curved, apsacline. Beak 
incurved. 
Brachial valve gently convex in lateral profile, broadly and gently convex in 
anterior profile. Umbonal region gently convex; sulcus originating at the beak, 
moderately wide and deep. Flanks slightly inflated. 
Measurements in mm.—117321b, length 6.3, brachial length ?, width 7.3, hinge 
width 5.5, thickness 3.5? 
Figured specimens.—117321a-e. 
Horizon and locality—Ward Cove formation in Virginia: + mile west of 
Pounding Mill, north of U. S. Highway 19, Pounding Mill (15’) Quadrangle. 
Discussion.—This species is represented by a few fragmentary specimens only. 
A small species is indicated which is not so strongly carinate in the umbonal 
region as F. subcarinata, F. dalmelloidea, and F. sulcata. It is more strongly 
