196 Cincinnati Society of Natural Fitstory. 
BYTHOCYPRIS DEVONICA, N. sp. 
Pilate XVI; Fas ae 
Size: Length, 1.55 mm.; heighf, tot mim; ihiekmesso.05 
mm. 
Carapace sub-triangular, ventral edge nearly straight, back 
strongly arched, ends subequal, the anterior slightly narrower 
than the posterior. Left valve larger than the right, overlapping 
it at all sides. Ventral and dorsal edges thick; sides of valves 
depressed-convex, with point of greatest convexity above the cen- 
ter in the large valve, and as much below it in the smaller. 
This form, perhaps, ought to be placed as a variety of B. phillips- 
zana, Jones and Holl, originally described from the Wenlock, 
but later recognized by Jones and Kirkby in the Carboniferous 
deposits of England. ‘The outline of the latter, which they distin- 
guish as var. carbonica, is almost exactly like that of our Devonian 
variety, but in end and ventral views the latter is thicker above 
and below, while the central portion of the valves is less convex. 
In the Silurian type of the species the dorsal and ventral edges are 
even more acute in end views. 
Position and locality: Devonian Bryozoa bed, Falls of the Ohio. 
BYTHOCYPRIS PUNCTULATA, N. sp. 
Plate X VIL, SPUes2 2a Oe 
Size: . Length, 1.93 mm_.; height, 1.15 miml; eiveiess ee 
mm. 
Carapace strongly convex, the height and thickness nearly 
equal; ventral edge straight, curving up at each end; back con- 
vex, the outline of the whole nearly semi-circular; greatest thick- 
ness of valves in the posterior half. Left valve much the largest, 
its edge overlapping that of the right valve. Entire surface neatly 
punctate ; puncte several times their diameter apart. 
I have a right valve from the Niagara shales at Lockport, N. 
Y., that probably belongs to a variety of this species. Its surface 
is also punctate, but the punctze are more closely arranged. The 
valve is also less convex, with the profile in a ventral view is some- 
what flattened centrally. If it deserves a name it might be called 
var. magarenesis. 
Position and locality: Devonian Bryozoa bed, Falls of the Ohio. 
