356 The American Geologist. June, i89i, 
12. Psilophyton princeps Dn. * 
13. Rhacophyllum truncatum Lx. f 
There are probably two additional varieties of Archceopteris, 
known from the Catskill of Pennsylvania, which have not been 
given in the above list. In 1890 Dr. Dawson, upon the authority 
of Mr. R. D. Lacoe, mentioned Archceopteris major Lx. , from the 
Lower Catskill of Meshoppen, Penn'a. % But, Mr. Lacoe wrote 
me Februaiy 10th, 1891, as follows: "The information given 
Dr. Dawson was in answer to general questions as to the fauna 
and flora of the Catskill of northern Pennsylvania and particularly 
anything associated with or in beds near to the Dictyo-cordaites. 
I mentioned Archceopteris minor Lx. , and A. minor var. major 
Lx. , and very likely not that the variety was unpublished. It is 
a large form of A minor, separated by professor Lesquereux and 
a drawing was made of it." February 19th Mr. Lacoe wrote me 
that ' ' Still another variety [of Archceopteris] was described by 
professor Lesquereux, but not figured. " In this last letter Mr. 
Lacoe stated that ' ' We have Haliserites dechenianus Gopp. from 
the Catskill of Meshoppen, several fine drawings of which were 
made for professor Lesquereux." 
There are references to other fossil plants in the Catskill, most 
of which are so indefinite that they possess very little value. Mr. 
Andrew Sherwood identified a Sphenophyllum allied to S. antiquum 
Dn. from the Catskill, four miles north-west of Mansfield, Tioga 
Co., Penn'a. \ Prof. I. C. White mentions "small egg-like 
*This species was reported by Dr. Dawson from Jefferson, Schoharie 
Co., N. Y., and at first stated to be Catskill but later, upon the authority 
of professor Hall, was changed to the Chemung (Quart. Jour. Geol. Sue. 
London, Vol. XVIII, p. 315 and additional note opposite p. 329). In 
reference to the geological age of this locality Dr. J. M. Clarke wrote 
me, March 5th, 1891, that "The horizon at Jefferson, Schoharie Co. r 
where the Psilophyton princeps came, is Hamilton. From there upward 
the succession is still a question for determination." 
However, the presence of this species in New York rocks, considered 
as of Catskill age, is shown near the close of this paper. 
fMr. R. D. Lacoe writes me that all of the species in the above list, 
with the exception of Archseoptcris jacksoni Dn., Cyclopteris valkla Dn. 
and Psilophyton princeps Dn. are recorded from the Catskill without 
doubt. It is well known that Mr. Lacoe's collection of American Pale- 
ozoic plants, at Pittston, Penn'a., is the most complete in the world; 
and, I wish to acknowledge the great assistance of this collection in 
verifying the range and distribution of the species mentioned above. I 
would also state that I am greatly indebted to Mr. Lacoe for his kind- 
ness in sending me this data; as well , as for other assistance in the 
study of Devonian fossil plants. 
{Canadian Record of Science, Vol. IV., p, 6. 
g2d Geol. Surv. Penn'a. G, p. 80. 
