DEVONIAN FAUNAS. 307 
broadly triangular. Brachial valve depressed-convex, flattened toward 
the cardinal extremities, the beak projecting nearly as far as that of 
the pedicle valve. Surface marked by more or less unequal, raised, 
radiating strie, which increase by irregular bifurcation; marked, also, 
by much finer concentric strie and by lines of growth which are most 
conspicuous near the front margin of adult shells. 
The dimensions of a rather large adult shell are: length, 6 mm.; 
width, 7.5 mm.; thickness, 3.33 mm. 
SCHIZOPHORIA MULTISTRIATA (Hall). 
Plate XXXV., Figs. 1-4. 
1859. Orthis multistriata Hall, Pal. N. Y., vol. IIL, p. 176, pl. 15, 
figs. 2 a—t. 
Description.—Shell subcircular or transversely subelliptical in out- 
line, hinge-line equaling about one-half the width of the shell. Pedicle 
valve convex, the greatest elevation posterior to the middle, a broad, 
shallow, ill-defined mesial sinus extending from the umbo to the front 
margin; beak projecting a little beyond that of the opposite valve, 
slightly incurved. Brachial valve more convex than the pedicle, gib- 
bous posteriorly. Surface of both valves marked by fine, crowded, sub- 
equal, raised, radiating strive, which increase by intercalation and by 
bifurcation, and are crossed by a few inconspicuous lines of growth. 
The dimensions of an average specimen are: length, 20 mm.; width, 
25 mm. 
Remarks.—This species has been observed only in the Becraft lime- 
stone. It differs from S. bisinuata, from the Coeymans limestone, in 
the simple sinus of the pedicle valve, not having a double depression, _ 
as in that species. In other characters the two species are much alike. 
