140 The American Geologist. September* 1893 
and about ten miles west of Springfield, Ohio. Near the up- 
per part of the ( Ilinton group. 
The so-called land plants described by Lesquereux f rom the 
Cincinnati group <>i' the anticlinal region, namely: Proto- 
st iij inn sigillarioides, Psilophyton gracillimutn, and Sphenophyl- 
I a in prima 'VU m, have had their claims as land plants denied by 
every competent observer whose botanical knowledge would 
warrant an opinion. The first species may be a f ucoid ; the 
second is probably a Dendrograptus or graptolite; and the 
last species is not even a plant, its organic character being to- 
tally unproved. 
The answer to the question proposed at the very beginning 
of this paper would be, that at present there is no evidence of 
the existence of land plants in the region of the Cincinnati 
anticlinal during the Clinton age. The writer does not care 
to deny that such plants may have existed in this area, though 
he is of the opinion, for geological reasons, that they did not. 
Certainly from a theoretical point of view, it is more than 
probable that at as late a time in the world's history as the 
Clinton age certain sea plants had already taken up the habit 
of growing in fresh water, and of the latter some had proba- 
bly begun to grow on land, wherever this land was. Theoret- 
ically, also, the original sea water should have been much less 
salty than to-day. The w r riter is hardly, however, of the opin- 
ion that plants of as high a degree of organization as the Ly- 
copodiacea' were already in existence during Clinton times, 
though negative evidence must never be considered conclusive. 
DESCRIPTION OF PLATE. 
Fig. 1. Cyrtoceras (Glyptodendron) eatonense (Claypole) Foerste. 
a. View of one of the lateral faces, b. View of the dorso-lateral angle 
with the dorsal side on the right and the lateral face on the left. 
Neither of these figures attempts to give more than the general form 
and arrangement of the " scars ; " the more minute surface char- 
acters of the latter are shown in c, slightly enlarged, d. The dorsal 
side, with the "scars'' omitted, showing the accidental lateral bending 
of the shell, which makes the detection of the true dorsal side so diffi- 
cult, as further explained in the text. Huffman's quarry, one mile south 
of Dayton, Ohio. 
Fig. 2. Cyrtoceras (Glyptodendron) eatonense Claypole. The origi- 
nal type specimen. An illustration prepared partly from a reverse 
drawing of the original cast, and partly from a gutta-percha cast made 
from the specimen by Prof. Claypole. Near Eaton, Ohio. 
