58 The American Geologist. jiUy, i89^' 
resembling in tliin sections the cross cut acanthopores of a 
Moiiticidipora, but never showing a central perforation as they 
sometimes do. 
The size of these nodules differs considerably in the same circle; 
some three or four are larger than the other intermediate ones and 
constitute the upper termination of the, before described longitud- 
inal crests indenting the orifices; the other smaller ones cause no 
perceptible indentations of the tube channels, but the}' are per- 
ceptible as delicate longitudinal striae (Wandstr^enge) on the 
faces of vertical!}^ cleft specimens, and better still in thin, longi- 
tudinal sections. The walls are actually composed of laterally 
anchylosed vertical columelles, which, counting the larger and 
smaller ones, amount to from ten to fifteen in each circumference 
of a tube. 
The specimens of CJtcetetes radians from Miatschkowa Govern. 
Moskau, which I have had occasion to examine, are of coarsely 
crj'stalline grain and do not allow of observing all the details of 
structure ; much plainer are they exhibited by specimens of 
Chcetetes milhporaceous from different localities in Indiana, Illi- 
nois and Kentucky, and in still greater distinctness all these 
structural particulars may be observed in the Devonian species 
found at the Falls of the Ohio and in the Eifel mountains. 
Noteworthy yet is the frequent development of morticules on 
the surface of Chxtetes specimens, which are occupied by tube 
orifices of larger size than the rest. In addition to the other 
points of structural similarity, these monticules seem to me a con- 
firmation of the close relationship existing between Chatctcs and 
MonticuUpora. 
After these preliminary remarks I will enter on the special des- 
cription of the Devonian species of Cluetetes. 
The specimens from the bed of the Ohio river I had collected a 
number of years past; on account of their external resemblance I 
had identified them without closer examination with a similar 
form abundantly found in the limestone formation of Sandusky 
and Kelley's Island, and provisionally labelled them with the 
name Chcetetes ponderosus. Later, Prof. Hall figured in one of 
his publications a form perfectly corresponding with the Sandusky 
specimens, and accordingly I adopted that name in place of the 
one given by me provisionally. 
Only recently, when I happened to look over these specimens,, 
