PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 885 
Discussion.—The interior details of this species are unknown; consequently, 
it is necessary to question the generic assignment which was made on the basis 
of form and ornamentation. This species is somewhat suggestive of G. sculp- 
turata but has a different outline, being squarer and more deeply concave. 
GLYPTOMENA SCULPTURATA Cooper, new species 
Plate 246, F, figures 16-23 
Shell attaining a width of about 3 inch; wider than long and with the hinge 
forming the widest part; sides gently rounded, oblique to subparallel; cardinal 
extremities slightly acute, anterior margin broadly rounded. Strong costellae 
separated by groups of smaller costellae numbering as high as 7. 
Pedicle valve unevenly convex in lateral profile, the posterior two-thirds gently 
convex, the anterior third fairly strongly bent toward the brachial valve; anterior 
profile moderately and broadly convex; umbonal region gently swollen; median 
region gently swollen; anterior and lateral slopes short and moderately steep. 
Interarea short. 
Brachial valve gently concave in lateral profile with the greatest concavity lo- 
cated anterior to the middle; umbo concave, the concavity produced anteriorly to 
form a shallow sulcus; sides and anterior margin fairly strongly bent toward 
the brachial valve. 
Measurements in mm.— 
Brachial Hinge 
Length length Midwidth width Thickness Height 
Paratype (117856e)..... 14.3 13.1 17.2 19.2 1.9 3.7 
(107850b)s 2.88 14.3 12.0 13.9 14.7 ? ? 
Types.—Holotype: 117856c; figured paratypes: 117856a,b,d; unfigured para- 
types: 117856e,f. 
Horizon and locality—Chatham Hill formation in Virginia: 1.2 miles S. 
31° E. of Sharon Springs, Burkes Garden (15’) Quadrangle. 
Discussion.—This species is characterized by moderate convexity and’ con- 
cavity and obliquely sloping sides. It is a larger, less concave, and less convex 
species than G. parvula. Its convexity is greater than that of G. ? prisca, and 
its shape is somewhat more rectangular and with more sloping sides than the 
Chazy species from New York. 
GLYPTOMENA sp. 1 
Plate 235, B, figure 2 
This species is suggestive of G. ? prisca (Raymond) but is more convex and 
does not have as narrowly convex an umbonal region on the pedicle valve. 
Measurements in mm.—117857 a, length 12.9, midwidth 13.9, hinge width 13.6, 
height 2.0. 
Figured specimen.—117857a. 
Horizon and locality—Ward Cove ? formation in Virginia: 4 mile south of 
Rocky Gap, Pocahontas (30’) Quadrangle. 
