376 The American Geologist. dune, Se 
original opening after my visit. Mr. Cooley in ’95 told me 
he intended blasting deeper to expose more of the stem. As 
uncovered at the time of my visit, the stem was seen to extend 
nearly horizontal for a few feet and then bend steeply down- 
ward.,’’* 
The magnificent. specimen now in the New York State 
Museum collected by Mr. Nevius was obtained according 
to Dr. F. j. H. Merrill “from the farm of Ogden H. Cooley, 
near Monroe, Orange Co., N. Y.,fand was apparently from 
the same quarry as that mentioned above. Excavation sub- 
sequent to the writer’s visit revealed the immense specimen 
and it is almost certain that the fragments found in 1890 came 
from the trunk secured by Mr. Nevius. 
The above notes were submitted to professor Penhallow 
who has written me the following letter regarding these spec- 
imens: “On referring to my notes, I find that the specimen re- 
ferred to you as determined to be N. Logan, was sent 
to me by Prof. Clarke under the impression that it might 
be N. Ortoni, but there was no indication whatever that it 
had been derived from a stem previously examined. The 
material came in two lots. The first showed typical Cellu- 
loxylon structure, and no nozinal structure of a determinable 
character. The second lot was somewhat better, and showed 
some fairly well preserved structure which served to indicate 
*the improbability of identity with N. Ortoni. At the same 
time the form of the radial spaces suggested N. Logani as 
the nearest affinity. The occurrence of Celluloxylon struc- 
ture is not incompatible with any species, since it only repre- 
sents a condition of preservation. N. crassum and N, Logani 
closely resemble one another, and since my last notes on these 
plants, a more extended opportunity to study fresh material 
of the Laminariee under varying conditions has shown that 
when sections are taken from different portions of the same 
plant, one may note structural variations quite parallel with 
those exhibited by some of ‘he so-called species of Nemato- 
phyton, and in consequence of these facts, I have been sume- 
what more strongly disposed to the opinion expressed in one 
of my papers, that the species so-called, which have been ~* 
differentiated for purposes of convenience, may in many cases 
* Letter of April 6, 1902. 
t Letter, March 4, 1902. 
