572 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
than half the width at the front margin. Sulcus shallow, abruptly bent toward the 
brachial valve to form a short, blunt tongue. Costae bounding sulcus strongly 
subangular and prominent. Flanks slightly convex with moderately steep slopes. 
Median septum reaching nearly to the middle of the valve. 
Brachial valve moderately convex in lateral profile with the unbonal region 
the most convex part. Anterior profile a narrowly rounded arch. Fold origi- 
nating at about the middle, moderately elevated anteriorly with rounded de- 
pressed flanks, steep lateral slopes. 
Measurements in mm.— 
Brachial 
Length length Width Thickness 
Piplotg pe... ose A. Ae cases 4.9 4.5 4.8 3.4 
Paratype <+(LLIT20%) s5.00ld Lee cas 5.6 5.1 6.5 4.1 
- CTGT IBS) opis SE tee 5.4 4.8 5.2 3.6 
Types.—Holotype: 111131a; figured paratype: 111128e; unfigured paratypes: 
I11128a-d, Il112Qa-c, I11130a,b, TII13Ib. 
Horizon and locality —Effna formation in Virginia: At the McNutt Quarry, 
12 miles southwest of Bland, Burkes Garden (15’) Quadrangle. 
Botetourt formation in Virginia: Near Cedar Grove Church and School, 14 
miles southeast of Harrisonburg, Harrisonburg (15’) Quadrangle; 1 mile north- 
west of Lexington, Lexington (15’) Quadrangle; 2 miles south of Hogback 
Mountain, 7 miles north-northeast of Lexington, Lexington (15’) Quadrangle; 
Catawba Valley, at junction of Virginia Highways 114 and 311, 4 mile southwest 
of Catawba Valley, Salem (15’) Quadrangle. 
Chatham Hill formation in Bland County, Virginia: on Grayson Farm, 4 
miles southwest of Bland; 6 miles southwest of Bland. 
Discussion—This species is characterized by its small size and the usual 
presence of 2 costae in the sulcus. The species is thus suggestive of members of 
the genus Plectocamara, but it differs from all of them in its partially nude orna- 
mentation and the presence of long septa. It is quite unlike any other described 
species. 
CAMERELLA MULTIPLICATA Cooper, new species 
Plate 112, E, figures 23-29 
Shell of about medium size for the genus, with length and width about equal ; 
greatest width anterior to the middle, giving the shell a pentagonal outline. An- 
terior margin truncated. Apical angle about 90°. Anterior commissure unipli- 
cate. Surface marked by subangular costae of which 4 or 5 occupy the sulcus, 5 
or 6 are on the fold, and 9 on the flanks. 
Pedicle valve moderately and evenly convex in lateral profile with the great- 
est convexity at about the middle. Sulcus originating about one-third the length 
from the beak, shallow, and occupying about half the width at the front. Tongue 
short, not strongly geniculated. Flanks gently convex with gentle slopes to the 
margins, 
Brachial valve somewhat more convex than the pedicle valve in lateral profile 
