Geology and Natural History. 221 
y some remarkable specimens obtained by Prof. Newberry, of 
New York, from the Corniferous limestone of Ohio, which indi- 
cate the existence there of three species of tree ferns, one of them 
with aerial roots similar to those of the Gilboa specimens. e 
whole of these specimens Dr. Newberry has kindly allowed me to 
examine, and has permitted me to describe the Gilboa specimen, 
as connected with those which I formerly studied in Prof. Hall’s 
collections. The specimens from Ohio he has himself named, but 
allows me to notice them here by way of comparison with the 
others. I shall add some notes on specimens found with the Gil- 
boa ferns, and on a remarkable plant from the Devonian of Caith- 
ness, kindly placed in my hands by Dr. Wyville Thomson. 
t may be further observed that the Gilboa specimens are from 
& 
with the arches, so that all belonged distinctly together. 
ingly slender, far too much so 
d 
* Abstract in Proceedings of Royal Society, May, 1870. 
