1883.] Lower Ponent ( Catskill) Group of Middle Pennsylvania. 277 
This is scarcely the place for a technical dissertation on the 
identity or distinctness of the species here represented by the 
names given above. But it may be briefly remarked that to C. 
Jacksoni is attributed the specimen figured in the Geological Re- 
port of the fourth district of N. York. It is also reported by Dr. 
Dawson from Perry, Me. Of C. kallana the very existence is yet 
in doubt. Mr. Lesquereux considers it a synonym of the pre- 
ceding, while Dr. Dawson makes it distinct. Cyclopteris minor 
and C. obtusa are the best known forms from the Pennsylvania 
Red Sandstone. C. rogersi rests, so far as Pennsylvania is con- 
cerned, on a doubtful fragment in the collection of Professor 
Hall, and Sphenopteris laxa Hall, is a synonym for C. hallana 
Goep., or C. jacksoni Dn. (if these are distinct). In this way we find 
there are only three species of the six named above, concerning 
which little doubt of their identity remains : 
Cyclopteris jacksoni Dn. = Sphen. laxa Hall = ? C. hallara Goep. 
i minor Lsqx. 
obtusa Lsqx. 
“ 
Add for the present to these, Rachiopteris pinnata Dn., and 
Rachiopteris punctata Dn., figured in the Geology of New York 
(3d dist, p. 191), and we have a total so far of five species re- 
Ported from the Catskill group of Northeast America. 
The Catskill Lepidodendron, of which a figure is given in the 
Geology of the Third District of N. York (p. 191), belongs, as 
sund as can be determined from the engraving, to L. gaspianum 
| To these six species if we add the Sigi/aria simplicitas of Van- 
: sia aces of 3d Dist. of N. Y., p. —), admitting it, to avoid 
‘ discussion, to be a plant, we have a total of seven species in all of 
Vegetable remains from that part of the Devonian which has been 
considered to belong to the Catskill group. 
| P see i the plants there are a few relics of Testacea reported 
% Le this group, which we must notice. Two species only with 
eh merous specimens have been assigned to it: 
= Modiomorpha augustata Vanuxem. 
(Cypricardites catskillensis,) 
oe figured, but without description, in the Geology of the 
thes istrict of N. York (p. 186). But as the beds in which 
Y Were found have since been referred to the Chemung or even 
