Geological position of the Catskill group. — Prosser. 355 
2. ArehcBopteris hibernica (Forbes) Lx. 
3. " macilenta Lx. 
4. " minor Lx. 
5. " obtusa Lx. 
6. "• rogersi ( Dn. ) Lx. 
7. " sphenophyllifolia Lx. 
8. Cyclopteris valida Dn.* 
9. Dendrophycus desorii Lx. t 
10. D ictyo-cordaites lacoi Dn. 
11. Lycopodites ricliardsoni Dn. 
February 12th, 1891 ; "As to the Montrose specimens I suppose all of 
them were from one place, but I may have in the first instance taken it 
for granted that Montrose is in New York, as the specimens sent to me 
were in general from that state. As to the specimens from Montrose, 
if my memory serves me, there were several, some of which I referred 
to A. jacksoni but one showing several fronds seemed to me different, 
and I referred it with doubt to A. rogersi. The specimens were re- 
turned to Prof. Hall and perhaps should be re-examined, more espe- 
cially as the more recently found specimens from Scaumenac have given 
new information. - ' 
Prof. I. C. White in 1881 reported this species from opposite Hones- 
dale, Wayne Co., Penn'a. (2d Geol. Snrv. Penn'a. G 5 , pp. 63, 187), and 
in 1882 from a cut on the D. L. and W. R. R. below Henryville, Monroe 
Co., Penn'a. (Ibid., G G , pp, 103, 320). Finally, Lesley says: "[C. jack- 
soni Dn.] in the Chemung-Catskill strata about Montrose, Susquehanna 
Co., Pa., as described by Hall" ( Ibid., P*, Vol. I, p. 171). 
In the Museum of Columbia College. New York, are specimens labeled 
" Arch&opteris jacksoni, from Montrose. Pa." Prof. H. L. Fairchild, 
March 12th, 1891, wrote me the following note : "The specimens of 
Arch a'opte rix jacksoni which you saw in Dr. Newberry's Museum were 
collected by me. These have been found at different localities through 
Susquehanna county, Pennsylvania. Most of these specimens came 
from a quarry near Montrose, Penn. They occurred at the lowest point 
in the quarry and the stratum was only touched ; but, before I knew 
it, that part of the quarry was filled in. That was many years ago ; the 
fossils are there awaiting some one who is willing to spend the money 
to excavate for them." According to Prof. R. P. Whitfield, the Amer- 
ican Museum of Natural History, Central Park, New York, contains 
some rather fragmentary specimens labeled " Cyclopteris jacksoni from 
Montrose, Pa." The New York State Museum of Natural History, Al- 
bany, N. Y., also contains specimens labeled " Cyclopteris jacksoni from 
Montrose, Pa," 
*On p. 830 of the Coal Flora, Vol. Ill, this species is reported by 
Lesquereux from simply the "Upper Devonian, Pennsylvania'"; but, on 
p. 885 it is given in the column of Catskill plants, although not men- 
tioned on p. 850 in the list of species from the different localities which 
have furnished Catskill plants. 
fThe organic nature of Dendrophycus is in dispute, Lesquereux de- 
scribed the genus, of which D. desorii is the type', as belonging to the 
marine algSB. Among the paleobotanists Dr. Newberry and Prof. Wan! 
still refer it to the algae, and each has added another species to the 
genus,from the Trias ; while Sir Wm. Dawson and J. Starkie Gardner 
do not regard it as of organic nature. 
