Prof. C. L. Herrick.^ Denison University., Granville, Ohio. 
Dear Sir : — 
I transmit herewith a brief report on Waverly bryozoa. Had I 
been less pressed for time it would without doubt have been more full 
and more reliable. Still, I hope you will find it suited to your pur- 
pose. 
By combining the fine lot of material you sent me for study with 
my own I believe I have been enabled to present a fair idea of the bryo- 
zoan. fauna of this much-discussed series of strata. That which strikes 
one as not only interesting but important in the questions at issue re- 
lating to the equivalence of the various beds comprised within the 
term Waverly group is the fact that no remains of this class of fossils 
have as yet been obtained from strata below the top of the Berea shales. 
So far as I have been able to ascertain there is a complete absence of 
bryozoa in all the divisions between the top of the Erie and the base 
of the Cuyahoga shales. 
In looking over the 41 species that have been determined, I find 
that no less than 17, or over 41 per cent, of the entire number, occur 
in the Burlington and Keokuk beds of Iowa, Illinois and Kentucky. 
Not a single species indicates an horizon above the base of the St. 
Louis limestone. Of these, 3 species occur in the Burlington and 16 
in the Keokuk, while 2 of the Burlington species also occur in the 
Keokuk. 
The bryozoa are thus decidedly indicative of an equivalence be- 
tween the Cuyahoga shales on the one hand and the Keokuk group 
on the other. 
Many of the species identified and others mentioned in drawing 
comparisons between nearly related forms are described in Vol. VIII, 
Illinois Geological Survey report. To prevent repetition the names 
of these species are Usually distinguished by an asterisk. 
’ Respectfully Yours, 
E. O. ULRICH. 
