OHIO STATE ACADEMY OF SCIENCE. D1 
from the bottom, others are inserted higher up. Cysts of 
moderate size. No. 1 lateral view; No. 2 seen from above. 
It is easily distinguished from all others. 
- Corniferous limestone, Ohio Falls. 
Cystiphyllum prosiratum, sp. nov. 
(Plate V. Fig. 6. Slightly reduced.) 
Corallum simple, turbinate at first, expanding regularly 
for an inch or so, then forming an offset, when an inch 
in diameter, either to produce another issue like the former, 
or bent suddenly at right angle to one side and assume in 
most cases a very flattened cylinder. The outcome from 
the first regular growth is very capriciois. Its epitheca, 
well preserved, is wrinkled by fine concentric striae. Calyx 
very steep, nearly one inch deep; cysts large. 
Corniferous limestone, Columbus, O. 
Chonophyllum curvatum, sp. nov. 
(BilatesIVEsy Pigee75) 
Corallum simple, transversely oval, strongly curved 
and halfways twisted to the right, with deep furrows and 
sharp concentric ridges and external markings of striz in 
the well preserved epitheca. Length of outer curvature 
4 inches, rapidly expanding from the small pointed apex. 
Calyx oval, 2 inches long, 13? inches wide, broad margined 
with an insertion of an inner cup, narrowing the calyx to 
one inch in length and ? inch in width; depth # inch; 4o 
cardinal lamella meet around a raised center, which divide 
at a short distance multiplying the number into 80. The 
broad border of the calyx is obliterated by silicification. 
Hamilton group, Crab Orchard, Ky. 
Aulacophyllum enormis, sp. nov. 
(Plate VI. Shghtly reduced.) 
Corallum turbinate, curved; epitheca finely striate, un- 
dulate, partly strictured, heavy wrinkled and partly denuded 
exposing a structure like a Cyathophyllum. Calyx 2% inches 
