310 
Aug. F. Foerste 
septal lines of both are distinct at the mouth of the calices, and 
extend only a short distance from the walls, leaving circular spaces 
at the center, and both show traces of denticulate margins along 
the septa. The fact that the calices are described as polygonal 
need not disconcert the student since even Nicholson described 
C alapcecta cribriformts as having the corallites for the most part hexa- 
gonal or polygonal. Specimens of C alapcecia occasionally occur with 
calices fully 3 millimeters in diameter. Moreover, the base of the 
Liberty bed occurs at several localities within two or three miles 
of Alexanderville, and C alapcecia has been found at this horizon. 
It is my belief that if the type of Protarea verneuilli ever should be 
found it would turn out to be a Calapcecia; either that, or it is not 
an Ordovician species at all. 
Calapcecia cribriformis, Nicholson. 
(Plate XI, Fig. 4.) 
Calapcecia crthriformis has cylindrical corallites which retain 
their cylindrical form owing to the fact that the walls of adjacent 
corallites are not in continuous contact as in genera of corals hav- 
ing polygonal corallites. The walls are penetrated by numerous 
mural pores arranged more or less in horizontal rows. The 
septal lines are distinct. In well preserved specimens their free 
edges are denticulate. The tabulae usually are not well preserved 
or may be absent, but probably were present in all cases originally, 
since they are abundant, alternating with the horizontal rows 
of mural pores, in the various species of Calapcecia described by 
Billings. 
Calapcecia cribriformis appears to be identical with Calapcecia 
huronensis, Billings, and the former name probably should be 
dropped, as acknowledged by Nicholson himself in later years. 
Geological position. Calapcecia cribriformis is common at some 
localities west of the Cincinnati geanticline in the lower part of the 
Liberty bed, from Henry county as far south as Marion county, 
Kentucky. It occurs at the same horizon at Wyoming, Cobb 
Ferry and 4 miles north of Richmond, in Kentucky. In the 
lower part of the Saluda bed it occurs from Madison, Indiana, as 
far north as Osgood. Stray specimens occur in Indiana as far 
north as Richmond, and are known in Ohio at various localities 
in Clinton and adjacent counties. Near Clarksville, Ohio, speci- 
