J. M. Safford on the Upper Silurian Beds of Western Tenn. 209 
are quite different. Here the characteristic sponges of the Ni- 
agara bed disappear; and so do the crinoidal forms so well illus- 
trated by Dr. Roemer. 
In their places we have other species, mostly brachiopods, the 
larger portion of which are known to occur in the 
derberg rocks of New York. Below is a list of some of the 
escribed species. These have all been collected by the writer 
from the bed in question. Most of them may be found in all, 
or nearly all the counties bordering the Tennessee river. With 
the exception of the last, they have all been compared directly 
with New York specimens. 
Eatonia (Atrypa) singularis. Rhynchonella mutabilis, Hall. 
Merista cP Per Orthis subcarinata, 
% (“) bella, Hall. “ — oblata, Hall. 
Rhynchospira formosa, Hall. “  yarica, Hall. 
. lobosa, Hall. - Spirifer perlamellosa, Hall. 
Nucleospira ventricosa, Hall. Strophomena punctulifera, Conrad. 
2 concentrica, Hall. Phacops Hudsonicus, Hall. 
Pentamerus Verneuili, Hall. Anisophyllum Agassizi, Edwards 
. galeatus, Hall. and Haime. . 
: y 
Plete lists of the fossils they contain. 
Lebanon, Tenn., January, 1861. 
