962 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
shale in the United States and of Soudleyella in the British sequence. It seems 
to be more strongly costellate than either of these two, and the interior of the 
brachial valve is different from that of both of them. 
The pedicle interior of Cristiferina is not distinctly marked off from that of 
many other dalmanellids, but the brachial interior is distinctive. None of the 
specimens of the brachial interior shows a stage with fulcral plates although the 
brachiophores are very much like those of Paucicrura. An unusual feature of 
Cristiferina is the preservation of the crura. These are rarely seen structures 
in the punctate orthids, but they are well displayed as short, sharp points given 
off at an angle to the brachiophore. The crus protrudes from the inside end of 
the brachiophore. 
The cardinal process of Cristiferina is the most distinctive feature of the genus, 
but it is quite variable. The shaft is short, usually stout and usually marked by 
a shallow median depression. The part of the cardinal process facing the in- 
terior of the pedicle valve is expanded laterally at the end of the shaft. The 
posterior face of the myophore thus forms a triangle. Down the center of this 
triangle extends a high, thin crest which divides the myophore. In lateral view 
this crest is notched just posterior to its junction with the myophore. Although 
some other dalmanellids have a crested myophore, none is developed to the 
degree seen in Cristiferina. 
CRISTIFERINA CRISTATA Cooper, new species 
Plate 157, E, figures 15-17; plate 157, G, figures 25-29; plate 158, C, figures 12-14; 
plate 160, C, figures 16-28; plate 160, D, figures 29, 30 
Subcircular in outline, sides and anterior margins well rounded; anterior mar- 
gin gently sulcate ; costellae numbering 2, rarely 3 to the millimeter at the front 
margin. 
Pedicle valve fairly evenly and moderately convex in lateral profile; anterior 
profile strongly convex and with long, moderately steep slopes ; beak moderately 
long, strongly incurved; umbo narrowly convex, the convexity extending to a 
point anterior to the middle but becoming vague thereafter ; anterior slope short 
and steep; lateral slopes long and steep. Interarea moderately long, curved, 
apsacline. Delthyrium nearly plugged by the crest of the cardinal process. 
Brachial valve gently and fairly evenly convex in lateral profile ; anterior pro- 
file broadly and gently concave in the median region but with gently convex lat- 
eral areas; median region fairly strongly sulcate, the sulcus extending nearly to 
the anterior margin but becoming very shallow in its anterior limit. Flanks 
bounding sulcus gently swollen; lateral slopes short and gentle. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
FYGIOtY pe 1. Seis 2s sere ue ps 6.6 77, 5.0 3.9 
Paratype (111794e)..... 7.0 6.2 7.1 5.1 3.2 
Ff (111794h)..... 0.3 8.5 9.1 6.5 4.3 
