56 The American Geologist. juiy, 1892 
ON THE OCCURRENCE OF TYPICAL CH/ETETES 
IN THE DEVONIAN STRATA AT THE FALLS 
OF THEOHIO AND LIKEWISE IN THE 
ANALOGOUS BEDS OF THE 
EIFEL IN GERMANY. 
Plate III. 
By Du. C. RoMlNGEB, Ami Arbor. 
The numerous forms formerly comprehended under the name 
Cluctetes^ by considering merely the general external resemblance 
of the fossils with the one described by Fischer under the name of 
Chcetetes radians, were found by more accurate microscopic ex- 
amination to exhibit many important differences in their structure. 
The majorit}' of this mixed assembly could be placed under 
Monficidipora, a generic group proposed by DOrbigny; another 
part was found to correspond with the forms described by Lons- 
dale under the name Stenopora; for still others the erection of 
new genera was deemed necessary, and only a very small number 
of them actually corresponded with Chmtetes radians, the type 
of the genus. 
(jlat'tetes so restricted, like Stenopora, was unknown in strata 
older than the Carboniferous period, but in the subjoined pages I 
am going to describe representatives of C/uatetes from the 
Devonian at the Falls of the Ohio and from the contemporaneous 
beds of the Eifel in Grermany. 
Before proceeding with the description it will be desirable, 
first, to define the characters distinguishing C/uvtetes from 3Jonti- 
culipora, Stcnopora and related genera. 
Common to all of these is the composition of their colonies of 
small elongated tubules which are in their whole extent inti- 
mately grown together; the channels of these tubules are inter- 
sected by more or less numerous transverse diaphragms, and 
are not in communication with the adjoining tubules by lateral 
pore channels as they occur in the favositoid tribe, whose gen- 
eral structure exhibits so many points of resemblance with 
Chcetetes that even today some naturalists not only consider 
Chmtctes as a subordinate member of the favositoid family, but 
have described characteristic Cluttetcs forms under the name 
Calamopora which is a synonj'm of Favosites. 
The above mentioned structural characters common to the 
various generic groups under consideration are subject to certain 
