OF DENISON UNIVERSITY. 169 
separated by angular interstitial cells. Non-celluliferous face wrinkled 
concentrically. 
Locality and position. Clinton County, Clinton Group, collection 
of Dr. L. B. Welch. 
CERAMOPORID^., Ulrich. 
Zoaria usually incrusting, sometimes ramose with hollow branches, 
or flabeilate. Cell apertures triangular or ovate, with a prominent and 
arched lip usually on one side. (Ulrich, Am. Pal. Bry. ) 
Genus CERAMOPORA, Hall. 
Usually incrusting. Cells angular, with the lip strongly arched, 
the aperture oblique ; cells radiating from one or more centers. (Ul- 
rich, Am. Pal. Bry.) 
XVII. Ceramopora expansa, James. 
{Plate XVII, Fig. 13.) 
Alveolites expansa, James, 1879, Paleontologist, No. 3. 
“ Corallum, a flat or undulating expansion, irregular in outline, 6 
inches or more in diameter, varying in thickness from less than one to 
over two lines. Corallites very oblique and more or less sinuous in 
their direction from the base or central axis to the surface. Calices 
very narrow, slightly curved, elongated slits, showing, generally, when 
a little weathered, a tooth-like projection in the middle of the upper 
lip, and arranged sometimes in series of short curved rows in a more 
or less alternating manner. About 4 calices in the space of a line. 
Walls of corallites thick. 
“Although the specimen from which this description is made was 
found spread over the surface of a rock— from which it readily 
scaled off — it is not certain that it was encrusting, as there is an appear- 
ance of something like a central axis from which the corallites grew 
in different directions to opposite surfaces, in a very oblique manner ; 
portions of the side next the rock show calices similar to the other 
