192 Cincinnati Soctety of Natural History. 
back, with submarginal ridges at both ends. In this species we 
have two blunt spines, instead of a ridge, at the anterior end. 
Position and locality: Hamilton group, 18 mile creek, N. Y. 
KIRKBYA SUBQUADRATA, N. Sp. 
Plaie KV, Ties, i a, Oe 
Size: Length, 0.87 mm.; height, posterior, 0.62 mm., anterior, 
0.57 mm.; thickness of one valve, 0.18 mm. 
Valves compressed, subquadrate, ends subequal, the anterior 
the narrowest and most curved; back slightly concave, ventral 
edge straightened, dorsal angles blunt, antero-and postero-ventral 
regions abruptly curved. Free margins with a sharply elevated 
ridge, enclosing the reticulated body of the valve. A _ sharply 
defined, large umbilical pit just in front of the center of the 
reticulated area. Point of greatest convexity a little behind the pit. 
This, like the next two species, is related to K. permiana, Jones, 
and XK. oblonga, J. and K. The relationship, particularly in this 
instance, is not very close, the valves of K. subguadrata being 
much shorter and more nearly quadrate, with a more distinct 
umbilical pit, and higher marginal ridge. 
Position and locality: Devonian Bryozoa bed, Falls of the Ohio. 
KIRKBYA PARALLELA, N. Sp. 
PlaiewXV Figs. 2a, 0: 
Size: Length, co mm.; height. o:477mm-: 
Valves suboblong, with subequal, rounded ends, straight back, 
and nearly straight ventral margin. Marginal ridgesharply elevated 
above the narrow, concave border, enclosing the delicately reticu- 
lated, and slightly convex body of the valve. Umbilical pit small, 
scarcely distinguishable. 
This species is closely related to X. oblonga, Jones and Kirkby, 
described from the carboniferous limestones of England and 
Scotland, and recognized now, for the first time, in the Chester 
shales of Kentucky and Illinois. The latter is illustrated on plate 
18 of this paper. Comparing fig. 4a of that plate with 2a of plate 
15, it will be noticed that the outline is almost identical in the 
